Allegation. We dont know that for a fact we have checked every donation that we have. We do not know of any individual that didnt legitimately give to our campaign and that we did uncover we returned them so that, um, they were clean. Reporter do you recall a meeting on front street with these individuals . I recall fundraisers. I recall a lot of meetings, a lot of people three years ago. I do not recall any specific, um, meetings of folks meeting speak one thing. Doing something that is inappropriate is a completely different and we have always been very thorough that have the feds ever subsequently contacted you or your campaign . No. We have been proactive trying to say is there something here that we should be paying attention to . Its been silent. Reporter the fbi did try. According to their own filings they set up an operation aimed at the ed lee campaign. And what did they find . Nothing. Im not bothered by the fact that people come after me. Being a public figure, um, anybody is free to do anything. What i have to do is make sure i hold myself and my team and my staff accountable to comply with all the laws to make sure that were conducting the citys business in the right way. Reporter now, a couple of followup points that we have been investigating. One, neither the feds nor anybody else has come up with proof that mayor lee did any favors for anyone in return for Campaign Cash. Theres even a question about whether the money got into his campaign. Which leads to a third question were those ed lee supporters who were supposedly promising access to the mayor actually scamming the fbi and keeping the money . At San Francisco city hall, phil matier, kpix 5. As for raymond shrimp boy chow, his federal trial on racketeering charges is supposed to begin in october. A bay area tragedy raising new questions about socalled ghost guns. Mail order gun parts that people can assemble at home. Kpix 5s cate caugiran on the weapons that are impossible to trace. Reporter ken, they are also relatively easy to make as you said. You cant track them. Theres no serial number or registration and no problem in the eyes of the law. Well, at least in this case. 21yearold scott shot and killed 19yearold clare orton before killing himself. He built both guns used in the incident after ordering parts from the internet. Anyone can order an unfinished part of a gun with the right pattern and the right tools, you can make a firearm untraceable. And if you dont have a record its legal. If someone chooses to manufacture a firearm we have to remember its lawful. The ones that were concerned are the individuals trying to circumvent that background check. Its scary in the sense that if we find a gun like this we cant track it back. This is an ak type rifle recovered at that location. Reporter atf couldnt trace this firearm. It was homemade. This is the loafer receiver area. No mark lower receiver area with no markings. Reporter a bill was defeated that would require these people who make these guns to register them. But with so many websites selling gun parts and how to videos would it be enough to save lives . Walnut creek police are not releasing the photos of the guns used in in this case but this is the first they have heard of it here. In walnut creek cate caugiran, kpix 5. A suspected serial arsonist believed responsible for more than 30 fires is under arrest tonight. Investigators say fires were set in eight east bay cities most of them along highway 4, 24 and marsh creek road. Kpix 5s da lin with how the drought added to the urgency to catch this firebug. Da. Reporter yeah, veronica. Investigators dont say they say they dont know what motivated the suspect to set those fires. They say the biggest fire was about 40 acres. They arrested 29yearold james wilson at his bay point home this morning. They have been watching him since april. In the last four months they believe he started at least 30 fires in Contra Costa County, the most recent earlier this week. Investigators say heres one that wilson started on july 20th. A grass fire burning next to highway 4 in bay point. They also connected him to another fire in lafayette on july 28. It was burning on a hillside next to highway 24. Fire investigators say wilson first started fires in his hometown of bay point then moved to brentwood, pittsburg, concord, walnut creek and other nearby cities. We are in a drought and there are other fires around and any fire thats started by an arsonist takes resources away from other fires that might have other threats. Reporter investigators say no one was hurt and no homes were damaged in the 30 or so fires. But they worry it was only a matter of time before things would escalate. They believe wilson could be connected to even more fires. For now he is only facing eight counts but more arson charges are likely according to fire investigators. His bail right now is set at 1 million. Live in concord, im da lin, kpix 5. More warm dry weather is causing a whole lot of headaches for crews monitoring the rocky fire in lake county. Low humidity could mean increased fire activity and so far its destroyed over 39 homes covered more than 68,000 acres, steep rugged terrain in the area is not helping firefighters. Andria borba is in lake county with the latest for us. Reporter this fire is dangerous. Its moved in all directions at once which is basically the opposite of what the fire textbook teaches you will happen out here and they say firefighters say that this fire could in fact get worse with the help of the weather today. And then a couple of water tenders. Reporter this is what hoping for the best preparing for the worst looks and sounds like. And probably strike with hand crews and dozer. Reporter outside the Spring Valley pantry firefighters from long beach and Orange County are figuring out how to protect hundreds of homes if the rocky fire explodes again in the afternoon heat. Todays kind of a pivotal day for us. We definitely had lower humidity last night but all that humidity has since gone and so its just as dry as it was three days ago. Reporter Spring Valley is north of highway 20. Brenda has been packed and ready to go for days. I even had food to go. So i figured i would have a way to make sandwiches and stuff for myself. Reporter across highway 20 and on the fireline the goal is singular, put the fire out and get life back to normal through any means necessary. As firefighters move out, pg e is moving in to get utilities running again. Helicopters are continuing nonstop batter drops from the sky. Left behind, firefighters working 24hour shifts are stopping small still smoldering embers from getting picked up in the afternoon wind and taking a ride and burning more. As the hours go by, homeowners are weary. Im ready, im ready for no more fire. Reporter now, firefighters hope that yesterdays weather with a bit of rain and that very high humidity from the marine layer that came in was enough to make this fire lay down promptly. They are hoping that this fire does not torch this afternoon. Thus far it has not. They are hoping that help yesterday was enough to make this thing stick. Live in lake county, andria borba, kpix 5. A palo alto Grocery Store closed but they are not letting developers off the hook. Kpix 5s john ramos gives us the story of a community that wants its produce within reach. Reporter the Edgewood Shopping Center off 101 in palo alto used to be anchored by a small supermarket. But suddenly in march the place closed. It hasnt been good for business at the nail salon next door. Have they said what they are doing to try to get a store in there . No. We have not heard anything about that. Reporter thats anger some Business Owners and homeowners in the nearby neighborhood. They say the owner of the center a Property Development greenp group called sand hill has a special obligation to keep a Grocery Store operating at this site. It seems the company was only allowed to build these multi Million Dollar condos on the back side of the property by signing a planned community or pc agreement with the city. Can they keep selling because one of the things in the pc is that there would be a supermarket so they could build their homes and sell them and three no, sir supermarket. Reporter lenore joined some other neighbors in an angry letter to the city urging it to stop sand hill from sellingmy more condos until a Grocery Store is reopened. As a result, the city has reminded sand hill of its power to impose a 500 a day fine if the pc agreement is not met. In fact, sand hill says they have approached 40 different grocery operators to see if they will come in all with no luck. They say its not easy to find a replacement vendor within four months time and that the threats and age gri letters are not helping. But the neighbors feel its necessary to keep sand hill and the city from ignoring the problem. I dont want sand hill to just make the money with us being inconvenienced and they get what they want and dont have to bother and go on to all the other projects. Reporter and they apparently feel 500 a day would be a good incentive to stay interested in finding a new grocer. In palo alto, john ramos, kpix 5. The city says so far there is no deadline set for sand how to get the store reopened. They say they usually give Property Owners six months before doing that. They cleaned it up only to find it filthy again. What has crews struggling to keep up with the trash on San Francisco streets. Wave good bay to her life as a beauty queen waving good bye to her life as a beauty queen. She is going into the military. Plus an injection that could potentially save the planet. What Silicon Valley scientists want to do to the clouds to chill out Global Warming. Speaking of clouds, Beautiful Day today but they were on the increase working their way up from the south. Great time lapse from the exploratorium 4 hours weather history there. Those clouds are going to get thicker. Some of them are going to yield rainfall before the end of the female announcer right now at sleep train get up to 48 months interestfree financing on tempurpedic. Save hundreds on beautyrest. Or choose 300 in free gifts with Stearns Foster. The triple choice sale ends soon at sleep train. A veteran Pittsburg Police officer survived an ambush by a murder suspect. That confrontation happened at 12th and harbor just before noon today. The officer was chasing the suspect on foot. Investigators say that man hid around a corner waiting for the officer and when he came into view the suspect opened fire. The officer fired back striking the suspect. Both were injured. But both will be okay. The suspect is tonight under arrest. Litter is lining more and more streets in San Francisco and in a city known for sensational views its hard not to point fingers about why the garbling is piling up. New at 6 00, Mike Sugerman reports on who is throwing the garbage on the street. Reporter if there was ever job security, welcome back to working to clean the streets of San Francisco. Never ending job. Reporter city crews work 24 7 but it doesnt always work. Kind of like playing whack a mole. They clean it up and then two days later the same place is filthy again. Reporter a recent survey said clean livable streets were san franciscans top priority. Its not working out that way. You have been here for 40 years. Just about. Reporter you ever seen the streets dirtier in San Francisco . No, i have not. Reporter its stunky, ugly. They have to get rid of this junk. Its dangerous. Then theres the logo of life in the city. Broken glass from somebodys car window. The amount of trash thats generated every day is amazing. Reporter but more now . More now. Reporter rick owns manages apartment buildings and sees this all time needles left behind. The Homeless People make garbage. They just do. I mean, thats just one of the things they do. When i get up in the morning, the streets are clean. By the afternoon they are in the evenings, i dont know. Reporter mindy is with the citys public works department. She says her people are out on a constant basis cleaning and responding to complaints but its hard to keep up. We have special projects, we are doing the alleys, we are doing residential neighborhoods. We do commercial neighborhoods. We are very responsive. Reporter they collect over 7 tons of trash a day and another 3 million is expected to be budgeted for 18 new workers. Like we said theres great job security in trying to keep San Francisco streets clean. In San Francisco, Mike Sugerman, kpix 5. Chopper 5 what is over athey are ton about an hour ago where Hillary Clinton is in town for fundraisers. Her first stop the home of a former facebook executive. The backyard is ready to go. Tables are set for what looks like an informal reception. Tomorrow clinton will attend an event hosted by San Francisco mayor ed lee. Afterwards, the democratic president ial candidate will raise Campaign Cash in los angeles. She will not be making any public appearances. The first debate for republican president ial candidates is tomorrow. And california Governor Brown has a question for the candidates. In a letter he asks, what is your plan to deal with the threat of Climate Change . Tomorrows prime time debate will feature so candidates, trump trump, 10 candidates all taking the stage. The remaining candidates will debate earlier in the evening. Silicon valley scientists are working on a potential tool in the battle against Climate Change. Only on 5 kiet do shows us how something called cloud brightening could combat Global Warming. You want to put the light on it . reporter Silicon Valley research Lab Scientists are working on what might be considered the option of last resort. Its an insurance policy. Reporter its called the marine cloud brightening project. The goal, fight Global Warming by making clouds over the ocean thicken and brighter so they reflect more sunlight and cool the planet. The team has reached a milestone with this High Pressure nozzle. This is basically saltwater. The salinity that comes out of the ocean. It may look like some normal water spray but it took the scientists a year to come up with the exact rate and flow and the pressure so that the water droplets come out to just the perfect size. Would you go as far as to call it a success . A partial success. So what you see is very small crystals of salt. Reporter the particles are so small to see them you have to use a laser. Once the nozzle is finetuned the plan is to use a barge to shoot the salt particles into the sky and see what happens. The researchers say you can already see the concept at work. These satellite images show ship tracks from vessels crisscrossing the ocean, spewing exhaust that turns into clouds that last up to a week. The project needs several more years and millions of dollars in funding. But in 2012, the National Academy of science wrote, the seriousness of the consequences of Global Warming merits research into the possibility of using cloud brightening for climate engineering. Robert wood one of the top atmospheric scientists in the world said we owe it to future generations to study it now. I dont think this should be a solution. But i think its appropriate at least to do the research to find out more about it. Reporter these Scientists Say the real solution to Climate Change is a reduction in Greenhouse Gases not cloud brightening. That being said, they hope to do some land based proof of Concept Testing by next year and if funding comes in they hope to do some testing on ships at sea by 2018 or 2019. In sunnyvale, kiet do, kpix 5. I can only imagine what conspiracy theorists are saying about this project. Right. Dont send me your email. [ laughter ] send him your email. [ laughter ] dont send me your email. Its just another thing. Theres one concern with it which is scale. If it works, you have one ship the Pacific Ocean is big. Its scale is the problem when youre talking about trying to impact the weather in any positive way. Weather is big. Thank goodness. I like the weather. Weather being big is a good thing at least in this corner of the studio. Lets talk about the weather for today and beyond. Cloud cover is returning but not at the golden gate. Look at that fogfree beautiful view. Its a nice drive home across the golden gate. Perhaps the most famous bridge on planet earth right here. Livermore 92. San francisco 70s. Oakland 78. San jose 79. Splashanddash this time tomorrow in cupertino. Weather should be partly to mostly cloudy rainfree but rain moves in toward cupertino by tomorrow night. And partly cloudy for outside lands. Tens of thousands of folks in San Francisco for that golden gate park. It should be a pleasant weekend with afternoon temperatures in the 60s. Changes beginning tomorrow. We turn cloudier and a few thunderstorms up towards tahoe in the north sierra. Redding 100. Monterey 74 degrees. Brilliant sunshine yesterday now clouds coming back and they are being brought by this area of low pressure. That guy will give us a bona fide rain chance late thursday night into friday morning. Its not going to amount to much but we dont get much this time of year. As this low swings by from midnight tomorrow night through 8 00 or 9 00 in the mor