In what is becoming one of the biggest set piece battles ever fought against socalled islamic state. Iraqi forces supported by shiite militias and the backing of the u. S. And iran have been trying to soften up dug in isis positions. But the push towards fallujah produced a push back. The iraqis have had to fight off an isis counter offensive along fallujahs southern outskirts. While large numbers of Government Troops are poised there, the full assault into the city seems some way off. If and when the assault comes, it will have to take account of the estimated 50,000 civilians trapped in the town. These are some of the 4,000 or so who have managed to get out. But they are almost all women and children. The men they say have been taken away. The fear is that isis militants are Holding People back to use as human shields. Fighting the people are between the hammer of the army and militias and the anvil of isis this imam says. Those who are inside cannot leave. Those who are outside cannot help them. Aid agencies are already calling the battle for fallujah a human tragedy. But calls for corridors to be established to let civilians escape the fighting have so car, scott produced nothing. Mark phillips in the london newsroom. Mark, thank you. It was a violent Holiday Weekend in chicago. There were 42 shootings and six people were killed. That shooting epidemic is claiming other victims as well. The children who witness the violence. Dean reynold now on a program that helps them deal with their wounds. Three to five shots fired in the area. Reporter the Police Dispatch calls come with numbing regularity. Gunshot wound to the neck. 12yearold male shot. But for those who see what the rest of us only hear, there is a pain that is real and long lasting. On the far south side of chicago, young eyewitnesses are trying to talk their way through it. In a 16week program called story squad, kids 8 to 18 learn how to compose narratives that turn their harrowing personal experiences into recorded stories. I remember being about seven when i first got caught in the cross fire. Standing on the porch. 16yearold malik hunter one of the first participants. What does it give you to talk about it . It just helps me inside. The childrens stories are unimaginable to those in chicago who live a few miles away. I was, i saw my father die. We were at the gas station. Then they did a drive by. For 14 edward, 15yearold jalesa, 14yearold sierra and malik theyre not fairy tales. Have you witnessed the shootings . Yes. Reporter like around here . Right about, beside my house. One in front of my house. Reporter create emotional state of mind with sound. Word. Music right. Grant burr runs the program part sound engineer part social worker. Does it feel good to get it out too, feel like you got it out. Now it is out. Next stage of story squad is finding ways to plug in the stories into a policy environment where they can have real impact. I was so mad. Reporter while talking about it does help, these are still children after all. All of a sudden i heard three gunshots. One of my brothers turned around and said mom. I got shot. Take your time. Im sorry. Reporter thats okay. How is your brother today . He doing good. So one story at least has a happy ending. Dean reynolds. Cbs news, chicago. Why are so many sharks lurking off the california coast . And there are new guidelines for preventing the spread of zika. When the cbs overnight news returns. Theres moving. And theres moving with move free ultra. It has tripleaction support for your joints, cartilage and bones. And unlike glucosamine chondroitin, its all in one tiny pill. Move free ultra. Get your move on. What are you doing . Sara, i love you, and. [phone rings] ah, its my brother. Keep going. Sara, will you marry. [phone rings again] what do you want, todd . . . . [crowd cheering] keep it going if you sit on your phone, you buttdial people. Its what you do. Todd if you want to save fifteen percent or more on car insurance, you switch to geico. Its what you do. I know we just met like, two months ago. Yes [crowd cheering] [crowd cheering over phone] what do advanced care . N an antiperspirant . 48 hours hehe feels nice this is very very smooth. I am not messing around its soft. Your antiperspirant should give you more. Than just protection. Try dove advanced care. For softer, smoother underarms. Seems like every time the toilet someones there to undo it. After a superior clean, apply the lysol click gel. To keep it fresh, flush, after flush, after flush. For a toilet that gets clean, then actually stays that way. Lysol that. Dont let dust and allergies get and lifes beautiful moments. With flonase allergy relief, they wont. Most allergy pills only control one inflammatory substance. Flonase controls six. And six is greater than one. Flonase changes everything. One hair color wants to to help you keep on being you. Nicen easy. Naturallooking color. That even in sunlight, doesnt look like hair color. It just looks like you. Nicen easy color as real as you are. Over the weekend, a woman was bitten and severely wounded by a shark off corona del mar, california. We sent carter evans to find out what is attracting the sharks. Reporter still no swimming allowed at a beach where a shark attacked 52yearold, maria korcsmaros, training for a triathlon, 500 feet offshore when the shark struck. Extensive lacerations to her right arm. The doctor says, korcsmaros will survive but a shark left a large bite mark. Extends from upper torso area to the pelvis. A lot of the sharks spend most of their time literally 100 feet off the beach. Reporter marine biologist chris low has been tracking the growing shark population off Southern California for more than a decade. Right now if i put this camera in the water well see a leopard shark. In 2014, he showed us how his team is using underwautder drones to follow and observe sharks. Lowe says juvenile great whites in the area is rising significantly. Theyre drawn to warm water caused by el nino and abundance of fish to feed on and also have no predators and great whites are a protected species. The questions we are frying to answer now why are they at the beaches . How long do they stay at the beaches . What makes this beach so much more special than that beach . Reporter low says the 6 to 7 foot juvenile great whites are skittish and usually stay away from swimmers. But with more sharks and more people in the water. The rate of shark attack is going to continue to go up. And the reason for that is simple math. Reporter doctors tell me the bite mark on this woman was 18 inches wide. Experts say that means this likely an adult great white shark. At least 10 feet long. Scott, back to you. Carter evans reporting. Carter, thank you. Coming up next a baby born in the u. S. Has a birth defect caused by zika. The zika virus lingers in the body longer than first thought. It is now urging people returning from areas where zika is found, such as brazil, to practice safe sex or abstain for at least eight weeks, not four. Late today we got word that a baby born in new jersey has microcephaly, an abnormally small brain. The babys mother from honduras apparently contracted zika there. In seattle, a lefty with great stuff, threw the ceremonial first pitch on memorial day. Burke waldren raced to the mound in dress whites. Former petty officer, part of the saipan invasion during world war ii. As for the pitch, not bad for 92 years old. ,,,,,,,, we end on a musical note. With some of the sounds that have evolved with this broadcast over its 68 years. As we introduce a new theme tonight. At the beginning in the late 1940s, the news provided the music and this was the instrument. Cbs news presents douglas edwards. Good evening, everybody. Leading the news, washington all the way. Wire service teletype pounding out stories accented by bells signaling an urgent item. New sound was added to the broadcast in the early 80s. This is the cbs evening news. Notice it still suggested the sound of a teletype and added a new beat. In the late 80s, cbs commissioned the first theme music for the evening news. For the next two decades, that theme with small variations. Became the signature sound of cbs news. [ applause ] in 2006, the broadcast got a makeover and so did the theme. Courtesy of oscar winning composer james horner. This is the cbs evening news. With scott pelley. In 2011 we returned to the classic. Good evening. But this year we decided it was time for a new beginning. We are creating the new theme for cbs evening news. So we commissioned composer Joel Beckerman to put it together. And he did. Much like we assemble the broadcast each day. Yeah, give me one second. Piece by piece. Until it finally comes together as one musical newsical symphony. And just as the eyeball tells you. Announcer this is cbs. We hope that when you hear this music you will know. This is the cbs evening news. Thats the cbs overnight news for this wednesday. For some of you the news continues. For others, check back with us a little bit later for the morning news and cbs this morning from the Broadcast Center in new york city, im scott pelley. This is the cbs overnight news. Welcome to the overnight news, im michelle miller. The United Nations issued a warning to the iraqi forces closing in on the city of fallujah. Beware civilian casualties. The u. N. Says 400 iraqi families gathered up by isis gunmen and taken to the sit inny center to possibly act as human shields. Civilians are trapped in the city. A few thousand managed to escape. Fallujah under isis control more than two years. Charlie dagata has been to the front lines in this war and is watching events unfold from london. Iraqi special forces say before dawn, isis militants used tunnels to get snipers and sent six suicide car bombs towards the troops all destroyed before they hit their target. Hint of the fight to come. Their accuracy may be lacking. But the aim for iraqi forces and shiite militias is clear. Tighten the noose on militants in fallujah. Ground troops are closing in on three sides, led by elite Iraqi Counterterrorism forces backed up by u. S. Led air strikes. But u. S. Military officials in baghdad tell cbs news iraqi forces have yet to advance into the city itself. And that wont be easy. Although a few hundred residents managed to escape. Tens of thousands more thought to be trapped in the city. Held hostage by isis ill tants intent on using them as human shields. Iraqi officials estimate more than 1,000 isis fighters remain in the city that was the first to fall to isis more than two years ago. It took eight months to recapture nearby city and this is what it looked like when it was over. Iraqi forces have discovered networks of tunnels left behind by isis militants. An entire neighborhoods boobytrapped with home made bombs. Last with iraqi soldiers outside fallujah they were worried the closer they got to the city the more vulnerable they would be to suicide car bombs trying to pierce their fragile front lines. Even as forces push into fallujah, isis struck back elsewhere. Unleashing a wave of suicide bombings in the capital that have left more than 100 people dead. And counting. This morning the u. N. Announced 3,700 people have fled since the offensive began. But theyre risking their lives to try. Isis controlled all of the roads leading out of the city. They have been known to execute anybody attempting to leave. Here in the u. S. , the outrage continues over the killing of harambe, the gorilla at the cincinnati zoo. Harambe was shot after a 4yearold boy managed to find his way into the gorilla exhibit. Local police and federal investigators are looking into the incident and the parents could face charges. But this wasnt the first bout of trouble at the zoo. In march some one left a door open to the polar bear exhibit. Two bears walked out and were later shot with tranquilizer darts. Jamie yuccas reports. Reporter cincinnati zoo Officials Say harambe was agitated and disoriented after heave encountered a child in his enclosure saturday. We did not take the shooting lightly. The childs life was in danger. Monday, Thane Maynard doubled down on the decision to shoot the lowland gorilla after a 4yearold boy climbed over a public barrier into the gorilla habitat. People who question that dont understand you cant take a risk with a silver back gore r goril gorilla. Three times bigger than a man. Six times stronger. Reporter kim oconnor heard the boy and his mother arguing shortly before the incident. Im going to go in. No you are not. Im going to go in. No you are not. The gorilla death is under scrutiny. 300,000 people signed signed a petition. Wildlife biologist jeff corwin isnt placing blame but says the public should be more attentive. We have responsibilities when we take our families. A lot of times we get lost in our cell phone or selfie picture, or texting. We are not keeping an eye on what is going on with our children. These are wild animals, not animtronics at dizzy world. The boy made his way past a 3 foot dense and 4 feet of plants and shrubs before dropping 15 feet into the mote below. And although the cincinnati zoo is standing by its decision, they too are mourning the gorilla along with jerry stones who took care of harambe for the first 15 years of his life. He was not mean. He was a gentle little guy. Unforeseen circumstance was born. He had to lose. Reporter despite the outcry over the responsibility of the boys parents, cbs has not confirmed whether his father was present at the zoo. Zoo Officials Say that they have drills to prepare them for these types of situations. And had practiced the week before the incident. In rome, work on a subway line had to grind to a halt when excavators came across ancient ruins. Selt reporter when expanding the subway line in rome there is time built into the schedule for what they call archaeological risk. Finding something they had never expect. It is a sitty with subway stops near places like the famed spanish steps. Trevi fountain. Or this stop, colleseo. Coliseum. So expanding the metro creates challenges and rather spectacular discoveries. We were invited to the construction site where the line c subway is being built, looks more like an archaeological dig. This is rome. Was it a surprise to find this . Yes, absolutely. Reporter francesco prespereti, showed us what they uncovered when digging down several stories to build the subway station. Now we are 9 meters deep. Reporter wow. Around 2,000 years ago, these were military barracks for emperor hadrians army. The rooms were decorated with mosaics and frescoes, the rooms were weapons storage and sleeping areas for troops of ancient rome. 13 adult skeletons were also uncovered. If we havent built this station, we would never find, never have found this, this, roman remains. Reporter instead of stopping work or relocating the find, the plan ties have an Architect Design a way to incorporate the discovery into the metro stop itself. It will become romes first archaeological station, and likely be along the lines of metro museums in places like athens greece where travelers at a number of subway stops can look at ancient artifacts across the capital. A subway system plagued by delays. Are we seeing the reason here . No. The problem is not the archaeology. Most of the problems of the delays in construction of metropolitana are due to finance problem. Reporter not having enough money . Not having enough money. Reporter the line c subway system not scheduled to be completed until 202021. Plenty of delays. Many for far l i did everything i could to make her party perfect. Almost everything. You know, 1 i n 10 houses could get hit by an expensive septic disaster. But for only 7 a month, ridx helps break down waste. Avoid a septic disaster with ridx. Apple and google on the cutting edge of turning your cell phone into a virtual wall e the whole idea has been slow to catch on in the u. S. But one ken tree, kenya has been using Virtual Currency for years. Lesley stahl paid a visit for 60 minutes. At a bus station in nairobi, buses were not only loaded with humans and cargo, but with cash. It used to be the only way for people working in the cities to get money to relatives back in their remote villages. Give the cash to the bus driver. Then you say when you get to the village, you will see someone at the crossroads, give the money to him. Guess what happens . The money evaporates. Reporter the ceo of kenyas largest cell phone provider, safaricom says his company sought to solve the problem. While a majority of kenyans dont have a bank account, 8 in 10 have access to a cell phone. In 2007, safaricom started offering a way to use the cell phone to send and receive cash. They call it mpesa, m stand for mobile, pesa is money in swa he swahili. Kenyas alternative currency safer and mr. Secure. Reporter you are texting money . Texting money. Reporter how sophisticate the is the phone that you use for mpesa, a smart phone . No, the cheapest phone you can have. Designed to work at the lowest level of technology. Reporter hello. Hi hour, are you . Im fine. Reporter to get the currency you go to an mpesa kiosk, give the agent 3,000 shillings, 30 in cash. She converts it to Virtual Currency on my account. Reporter this is pretty easy. Not like omening a bank account. There are over 100,000 of a gents look her across kenya creating a giant grid of human, atms. For most this is a side business. So a pharmacy will sell mpesa or roadside spice shop. This basher will give you a shave and mpesa. Yes, you can even buy mpesa here. This is banking. Dent need the branches. Dont need the branches. Dont need the atm windows. Absolutely not. Scrolling down the options on the menu. Send money. Withdraw cash. Pay a bill or buy goods and services. Everyone uses a pin number for security. But this is not like paying with your smartphone in the u. S. Because our devices are linked to a beeni bank account or credt card. Most kenyans dont have a bank klt. The phone is it. Thats it. Now spend the 3,000 shillings on anything. Shopping in the name of journalism. I like this. Can i pay you in mpesa. If you have it. On the phone. Click the button it goes. Daniel says kenyans to it for everything from taxis to taxes. Is it safer for you and for me to use mpesa . Yeah, very safe. Reporter do you use mpesa to buy gas for the car . Absolutely. Reporter pay all your bills with mpesa . Most bills. Rarely go to the bank nowadays. Reporter at my destination i tried using the phone money. I have never done this before. You are my very first mpesa. Mpesa skus myrrh. Reporter i typed in his mobile phone number and the amount. 700 shillings or 7. I will give you 1,000. Thank you very much. God bless you. God bless you. Reporter there we go. Now my pin number. No, i will not tell you. That is your top secret. Reporter what do i do now . Accept. Reporter accept. Okay. Yeah, it does come. Reporter it worked. Now i will go spend more money. Hello. How are y