Need to be here. The report of a potential active shooter turned out not to be true but Officials Say the caller did the right thing by alerting police. The 2 1 2hour incident closed m street between south capitol and 11th street southeast. Other buildings with federal agencies and even some schools were closed as well. Officers at the navy yard search building 197, interviewing employees. Emotions ran high because thats the same building were in 2013, a lone gunman killed 12 people. But today, the investigation revealed there was no gunman, no shots fired, no one was hurt. Im very proud of all of the officials that anticipated the call. We know that there have been a lot of Lessons Learned from previous incident fatality here at the navy yard. And we have found that there has been a clear, coordinated and convincing response to this scene. Reporter heres what will happen next. Law enforcement agencies that responded here today will hold an afteraction meeting with the navy. We are going to review this again to see what went right and what we can continue to improve upon to improve our procedures in the future. Reporter d. C. Police chief cathy lanier says todays exercise energy her opinion, was a smooth, wellcoordinated Police Response to a potential threat. That is the latest live at the Washington Navy yard, chris gordon, news4. Todays massive Emergency Response looked a lot like the scene after the shootings at the same location two years ago. Our pat collins talked with people who work on that compound who will never forget that day. He joins us now with their reaction. Pat . Reporter doreen, he is a navy officer. He has seen more than his share of action. But you never get used to Something Like this. They say whats the chances of lightning striking twice . Never thought it would happen again. Reporter thats lieutenant commandser scott williams. He was here in 2013 during the real shooting with the real gunman that led to the death of 12 people. The shooting scare this morning cement him ducking for cover. Heard someone yelling, you know get out of the Building Stay away from the cafeteria, get out of here and everyone started running toward the exits and so we were nearest an office so we just dove into the office and locked the door. Reporter Cassandra Johnson remembers the attack two years ago. She was at the navy yard today. Is it tough coming to work here with all this . Yeah. Its kind of screwy. Because a lot of people saying to themselves why go back there . Its just like you at the mall. You on your own. Reporter at the same fence at Depaul Catholic church, a mass for the people at the navy yard. How do you tell people to deal with it . Encourage them to pray. To be with each other. To comfort one another with that assurance that peace to bring to us. Reporter it appears tonight that normalcy has returned to the navy yard. But for some people, it may be some time before we can truly confirm that. Now back to you. Thanks, pat. As pat noted the scene at the navy yard brought back a lot of very unpleasant memories. It was september 16, 2013. A man named aaron alexis a contractor for the navy, opened fire inside building 197 at the navy yard. When it was all over 12 people were dead. Alexis was shot and killed by the police. It was one of the worst Mass Shootings ever at a u. S. Military facility and one of the deadliest single events in the Nations Capital. A lot has changed since that shooting rampage nearly two years ago. As news4 as the news4 iteams Scott Macfarlane reports now, d. C. Police have the response and the coordination between the many agencies involved was a lot smoother this time around. Reporter two years ago, after the navy shootings, d. C. Police say there were too many vehicles on the scene, so crowded, officers struggled to maneuver around the area and navigate the building and that not all of the Many Police Agencies on the scene were on the same page. Two years later, the mayor said Police Worked well together. Im very proud of all of the officials that answered the call. We know that there have been a lot of Lessons Learned from previous incidents. Reporter but why did so Many Police Agencies respond to what amounted to a false alarm . Because different agencies have different specialties. U. S. Park police flew their eagle two helicopter above the navy yard today, a specialized unit from which rescuers can rappel to the ground in an emergency particularly helpful because its kept in a hangar in southeast d. C. Within close range from the navy yard. We have a crew here at what we refer to as the eagles nest and they are ready to launch any time. Reporter a u. S. Park Police Helicopter looked at victims from the roof from 197 in 2013. We saved lives with that aircraft. Reporter u. S. Capital Police Deployed their bomb squad to the scene today, an expert unit which handled more than 3,000 calls about suspicious packages or vehicles along Capitol Grounds in just the past three years. They have stateoftheart robotics, allowing them to inspect and deactivate a bomb from a safer distance. Officers tell us they work as a team with other Police Agencies when there is an emergency call. Professionally, i can count on everyone of them. And a great amount of pride down here. Doing this job, doing it as the city they are doing it in. Reporter fbi agents naval s. W. A. T. Team and u. S. District police among the agencies involved today and stayed in 2013, agencies responding to the Navy Yard Shooting need to do more training together to prepare for future undents. Jim and doreen, today clearly was their first test. Heard so much from communication issues from a couple of years ago did that work better that time . They trained in february 2013. They trained in february 2014 across the country, including locally. D. C. Police will tell you it was effective. Effective and most impressive as an effect. Wonderful to see how the guys responded down there. Thanks. Our coverage of the navy yard lockdown continues. In our next half hour the psychological damage for workers who may be dealing with posttraumatic stress disorder and the weeks and months to come. Plus, how todays scare and the recent Terror Threat is affecting people ahead of the fourth of july festivities here. Thats tonight at 6 30, also posted photos from todays dramatic Police Response on our nbc washington app. Just search navy yard to check it out. Developing right now doctors are working to save enforcement officials who are critically injured today during the world police and fire games. It happened during a bicycle race this afternoon in the Prince William forest park. Mark segraves is gathering the latest information right now. He is in wood bridge virginia. Reporter jim this is the very latest from Prince William county police. One of the victims from that race has now been listed as in grave condition. All three were listed in Critical Condition facing lifethreatening injuries but now told at least one of those riders is now in grave condition. All three are in their mid40s and all three are members of Law Enforcement agencies. One from the United States two from other countries. Heres how a Prince William county Police Officer described the accident to us. We responded out right around 12 30 p. M. This afternoon to investigate a crash involving multiple bicyclists that were participating in the world police and fire games. As of right now,bicyclists were traveling down hill. One of them for an unknown reason right now, lost cell of the bike and crashed, causing a chain reaction. We have three bicyclists that were significantly injured and were taken to area hospitals for treatment. Were reporter i just got off the phone from a spokesperson at the police and fire games and expecting police to issue a statement updating us on the condition of all three riders any minute. Stay with news4. We will bring you that just as soon as it happens. Back to you in the station. Mark see graves reporting. At least one of the cyclists was medevaced to the hospital. We know that. Right now, family, friends and fellow competitors from the world police and fire games are showing up at the hospital. Some of them in their jerseys others in Law Enforcement uniforms. Once again, three competitors, Police Officers injured in that bike crash in Prince William county. One is in grave condition two in Critical Condition. We will keep you updated as we learn more on this throughout the evening. Now to our weather and the fourth of july Weather Forecast is always important around here. Veronicas been monitoring our chances for rain this weekend. She is in the storm center with more. Vj . Yeah. Well, lie i can to be optimistic im monitoring chances of snipe and some higher chance of temperatures. That will be nice to get it does look as though we are going to get into that. Todays average high 88 degrees. Today, we only hit 77. We are going to see some higher temperatures coming our way, as we move through the Holiday Weekend this evening. If you are going to be going out a little bit of clearing, dropped to 70 degrees, even cooler temperatures see the rain down to our south, but first, heavy rain that will be moving through before we can start kicking off the fourth. Show you where and when we can see a little bit of flooding taking place. Thats right, veronica. New details about a person that caused a flight to d. C. To divert to ohio. It was United Airlines flight that made an Emergency Landing in columbus late this morning. Passengers on that plane say that a woman was making threats. They say she appeared jittery and suspicious. Flight attendants moved that woman to the front of the plane and a short time later the flight from st. Louis to dulles landed in columbus where that men was swept. Nothing was found. Passengers topped on. Coming up, a surprise twist in court we will tell how is defending the Police Officer who assaulted a High School Student in maryland. We do it all the time step out of the car hand the keys over to a valet and head inside. Only to pick the car up later. One d. C. Man did that in Northern Virginia today. The problem is he hasnt seen his car since. We have a subject have an injury from possible shark. Seven attacks in three weeks. Tonight, the growing fear is after a series of shark attacks at leave early go roam sleep in sleep out star gaze dream big wander more care less beat sunrise chase sunset do it all. On us. Get your first months payment plus five years wear and tear coverage. Make the most of summer. With volvo. First responders, respond to lifeguard beach. We have a subject has an injury from possible shark. That was the call for help after the latest shark attack along the North Carolina coast. A man is recovering after he was bitten several time use the ocracoke island. Tonight, officials are looking for any patterns after seven attacks that have happened in the last three weeks. They are especially worried heading into this busy holiday arah daloff joins us now from the outer banks. Hi, sarah. Reporter hi dore reasonable you know this is expected to be one of the biggest tourism weekends of the year, a weekend that coincides with what experts are calling a perfect storm of companies for sharks. Just the latest in a series of shark attacks. A 68yearold man bitten while swimming in waistdeep water off ocracoke island. Could you see a pretty decent size, baseballsized gash out of his knee. Reporter eyewitnesss say the victim was able to swim to shore before being airlifted to a nearby hospital. Theres been an alarming increase in the number of shark attacks along the North Carolina coast, seven in three weeks. Patrick thorton of charlotte suffered serious injuries after an encounter with the shark. I felt myself instinktively punching the shark realizing that a shark is upon me. Its attacking me. This could be it. Reporter in less than a month, 8yearold brady noise suffered minor injuries but two teenagers each lost arms after the being bitten. It is unusual. The water has been warm this year. The sharks are i think, heading north. Reporter experts say a number of factors could be causing these recent shark encounter he is. North carolina is a very popular tourist destination, with lots of beach visits lots of time in the water. These incidents will happen. Reporter as the holiday bond begins, some dont seem too worried. There are going to be shark attacks always, so you cant let that hold you back. I love the water so im not going to let the fear of a shark attack keep me out of the water. Reporter while others will likely stay out of the water and up on the sand. News and so far, there are no plans to close any of the beaches here this weekend. Officials are issuing a caution to stay alert and use good judgment when they are in the water. In North Carolina sarah daloff, news4. Thanks sarah. Around these parts, lots of folks have their eyes on the radar. Fourth of july holiday coming up. Question always is whether the weathers going to allow us to do all the thing wes want to do. Our forwardlooking and brightnoted veronica tells us that we should be thinking more about the chances for pleasant weather rather that possibility of glass halffull kind of gal. Exactly. All about planning. We are really going to go through this period here the holidayed with, get a little bit of rain, a lot of rain then a little bit of rain. By the time we get to the afternoon, evening hours, when it counts, a little bit of rain. Theres the optimistic view. Showers setting up a little bit. Showers that are kicking out of here, very light today. And awfully spotty east in delaware, down to the south where they have been the bulk of the rain for much of the year, thursday here, because of the area where the weather front is. In fact show you that front, see some thunderstorms this area would be a little bit more up to the north across Southern Maryland today but that front did not quite make it got the storms, one system kicking off the coast give us just a little bit of clearing as we move through in the next couple of hours and into early tomorrow morning. So our best chance of seeing some snipe, this second area of low pressure, it will sweep in tomorrow. Thats whats going to kick off some heavier rain. In fact, look at the totals here as they come in Culpepper Fredericksburg around, areas of pax river all this blue, red and orange, more than an inch of train could fall by the time we get to saturday lunchtime, and halfinch totals, d. C. Up to the north into Montgomery County and Loudoun County. Again, you get the idea more rain setting up to our south and southwest. For friday afternoon some showers. For friday evening we will have some moderate rain moving in. For friday night, i think it could get heavy, got our best chance of floodinging as we get going for saturday, your fourth, here it is, 80 chance of rain, 7 a. M. Down to a 70 chance by 11 a. M. , a 40 chance by 3 p. M. In a 20 to 30 by the time the fire works kick off. So, improving conditions for your fourth of july, i will have those afternoon and evening temperatures coming up for your fourth later this hour. 77 now, 75 looking dry. Temperatures start. Felt more like a spring day. We will have a carbon copy day coming up tomorrow, from 60s to about 71 degrees wakeup forecast, theres your high temperature, 77, 79 degrees fairly uniform temperatures again because of all the clouds that we will have across the area. The best chance of sunshine, early in the day tomorrow, more coming our way, higher chance for the afternoon and evening on friday. Here it the rain coming in 9 00, theres the hours around 7 a. M. Saturday with rain moving out, so we are front loaded on the rain for your fourth 70 to 80 fourth of july afternoon, a 30 chance of scattered showers and thunderstorms, i will show you in a cou minutes where i think these showers, thunderstorms, the best locations where they will set up on the fourth and again, take a look at those saturday evening temperatures. Thanks, veronica. If youre making plans for the fourth of july, pose a list of the best fireworks displays in our region. Head to our nbc washington app and search fireworks finder. The impact may be felt for months to come. We will take a look at the psychological damage for some navy yard workers after that scare today. Hundreds of thousands of people are expected to participate in the weekends festivities. Coming up at 6 00 what we have learned about Law Enforcements biggest concerns and how they plan to be addressed. Another person joins the crowded field of president ial candidates. Nbcs chuck todd tells us whos in whos former virginia senator jim webb made it official today he is going to run for president. Webb is the fifth democrat to announce. A nbc news wall street journal bomb put him well behind Hillary Clinton and ahead of former governor martin omalley. Webb acknowledged his long odds today but said that America Needs a fresh