We now know where it was coming from. What we dont know is why. Atf investigators have concluded that a gas explosion occurred in the basement of the apartment building. It happened in the meter room similar to the one pictured here. The gasfueled fire destroyed everything above it. At this point in time in the investigation there is no indication that a criminal act occurred. Reporter now the ntsb takes over the investigation to determine how the gas ignited. The smell of gas was reported to Montgomery County fire and rescue on july 25th by this resident. He says he also smelled gas the night. Explosion in this building, but he didnt have time to call 911 because just moments later it blew up. I was able to hear like a noise or something and i knew not exactly but where the gas was coming from, from like the basement. Reporter hes hired a lawyer. A Landlord Company has a responsibility to protect its tennants from known hazards. Reporter this couple told news 4s ericor, gonzalez how they barely escaped death. A friend kicked down their door. The wife jumped from the third floor balcony and the husband walked their two children downstairs to safety just before the floor of their apartment collapsed. Search team recovered seven bodies from the collapsed apartment building, but so far the remains of only three have been identified. Augusto jimenez sr. , maria castellonmartinez and saul paniagua. Unfortunately, when we talk about the science involved in identification, theres no quick solution. Reporter a final note about that possible lawsuit. We reached out to the Flower Branch apartments by both phone and email asking for their comment, but we have not heard back from them as yet. Silver spring. Doreen, back to you. Chris gordon, thank you. Thank you, chris. A developing story tonight. Prince georges county Hospital Center officials confirmed that a potentially deadly bacteria was found in the hospitals water system. They say pseudomonas bacteria was found in four sinks and they were in the neo natal unit. Three babies died. Its unclear if the bacteria played a role in their deaths. Three other babies were tested and the nicu has been killed. More bacteria was discovered in an adult care unit outside the nicu earlier this week. We began bathing our healthy newborns in bottled water to ease any concern for their parents. Wsse is stressing that there is no contamination in the Drinking Water surrounding the community outside had the hospital. A new Water Filtration system. We have new details tonight about that gas station incident involving four team usa swimmers. You probably already by now have seen the apology posted by ryan lochte accepting responsibility for his role in what went down. Lochte initially claimed he and his teammates were victims of an Armed Robbery, but tonight new police documents out of brazil show the other swimmers told police a different story. News 4s david culver is outside jack congers home in rockville with more. David . Reporter jim, it is important to note here that brazil i dont know Police Originally interviewed jack conger as a witness, not as a suspect, and according to that Police Statement investigators say conger told them that ryan lochtes original claim was a lie. I cant comment on anything at this time. Reporter dave conger not rereeling where his son jack is but is acknowledging that hes relieved his son is back on u. S. Soil. Im glad hes back, absolutely. Reporter this is video of conger arriving with teammate gunnar bentz to Miami International airport. This photo shows the two embracing each other. A day earlier brazilian officials pulled them both off their u. S. Bound flight for questioning, trying to get more details of what exactly happened last weekend. And then the guy pull out his gun, he cocked it and put it to my forehead. Reporter what was initially reported by star swimmer ryan lochte as an Armed Robbery said it was a drunken incident. The four emerged from the back of the gas station along with the station employee and told to pay for the damages. Police say conger told them that lochte ripped off a board attached to the side of the station that caused a lot of noise. Investigators note that conger also saw on the news the statement ryan made and realized ryan was lying about what had happene statements about what had happened. Lochte apologizing friday in this Instagram Post writing in part i accept responsibility for my role in this happening and have learned some valuable lessons. A fourth swimmer, jimmy feigen, ordered to donate nearly 11,000 as a condition of brazilian authorities allowing him to return home. Back in congers rockville community, signs of support still hang high. While officials in brazil may be done with the matter, even accepting lochtes apology late today, it seems that usa swimming could still act on this and issue some sort of sanction against lochte and the other swimmers, anything from a fine to a suspension. Doreen . All right. David culver, thank you. Metro is investigating another possible red signal violation. It happened this morning in the West Falls Church rail yard. There were no injuries or damage. Earlier this week federal officisl problem with train operators running red lights saying there were at least 68 incidents since 2012. Hundreds of motorcyclists rolled through maryland and into Northern Virginia today as part of americas 9 11 ride that. Ride started this morning in shanksville, pennsylvania. Chopper 4 was over the riders as they made their way along the dulles toll road on the way to the pentagon late this afternoon. The ride will wrap up in new york city tomorrow. This is the 16th year for the ride. Its meant to honor First Responders and raise monday for College Scholarships for their children. Donald trump appears to be listening to theives have people who urged him to act in his words more president ial. He met with victims of the flooding that has ravaged louisiana, but the visit was partly overshadowed by another campaign shakeup. Today his Campaign ChairmanPaul Manafort resigned. News 4s Jennifer Johnson has our report. Reporter donald touring floodravaged louisiana, showing empathy for homeowners who lost everything. We lost everything and knew you would come. Reporter part of the new president ial acting trump. Nobody understands how bad it is. Its really incredible, so im just here to help. Reporter after two new hires at the top trump Campaign ChairmanPaul Manafort has resigned. The poll numbers, particularly in the battleground states, are ever wide things and youve got to reverse that and demonstrate that you are trying to reverse it, and usually thats going to require a leadership change. Donald trumps america is secure. Terrorists and dangerous criminals kept out. Reporter trump has unveiled a new ad running in battleground states, ohio, florida, North Carolina and pennsylvania. And last night trump sort of apologized for making offensive comments that may have hurt people. And believe it or not, i regret it. Reporter meanwhile, documents released this week to Congress Show hill hill told the fbi that former secretary of state colin powell advised her to use a personal email account while she was in that washington. Colin powells office confirm to nbc news that he wrote hill hill an email describing his use of his personal email account for unclassified messages and said it vastly improved communications within the state department. A state Department Inspector general report released in may says that by the time clinton was secretary of state the use of a private server was neither allowed nor encouraged. Two men leading separate Church Youth Groups in Prince William county are charged tonight with inappropriately touching teenage girls. One has been fired, but leaders at the Second Church are defending their youth pastor. Northern Virginia Bureau chief julie carey joins us from one of the congregations now coming to terms with the news. Julie . Reporter mmhmm. Well, doreen, big red brick building behind me is the life church. Im told its one of the Fastest Growing churches in the country with four locations in Northern Virginia. Tonight churea saying he denies the allegations against him. 25yearold jordan baird is the youth pastor at the life church in manassas, but recently Prince William county police were told he had an inappropriate relationship with a 16yearold girl from the church. On numerous occasions between january and september of 2015 sent Inappropriate Text Messages as well as had inappropriate touch with the juvenile on multiple occasions and one of those incidents was as the church. Reporter jordans father david is the Senior Pastor and joshua baird is the associate pastor. Jordan led the youth groups here. Today the church issued a statement saying that a Church Volunteer first notified leaders of the alleged misconduct in early june. They placed jordan baird on leave of absence as they conducted an internal investigation. Then on july 13 Prince William county police notified the church they were but the life church wasnt the only place of worship that got bad news this week. This is grenwich Presbyterian Church and there the derrick trump was arrested for i Inappropriate Conduct between him and a jauf nile. Trumps former church fired him in june. A statement says he was terminated, quote, due to his failure to live up to the high standards we require of our staff. Were satened by the impact of derricks action and invite the prayers of the community for all that are involved in this matter. Back live now at the life church. Its been an especially tough week for the baird family. On top of jordan bairds arrest, his uncle, Senior Pastor david bairds brother, passed away. The family will gather toghe they have already found a defense attorney to represent jordan baird in court. Back to you now in the studio. Julie carey reporting, thank you, julie. A dramatic moment inside a local courtroom as a mother delivers a message to her daughters killer. Why her words left so many people stunned. Im darcy spencener northwest washingt washington. A man was hit and killed here by a hitandrun driver early this morning. Coming up, one idea to make this a safer intersection. Plus a live report from rio as wendy shows us the exotic sites and sounds of brazil during the games. Above 90 today and im tracking some rain over the weekend and then a great change, a change were all going to lot. See you in a minute. Know you can keep your financial big picture under control. Know you can see how much you have to spend and whether you should transfer funds. Know you can easily keep track of what youre putting away. And know youre budgeted for the great escape. Thanks to virtual wallet by pnc. [ hip olympics 2016, let ] me get you on my level. So you never miss a moment, miss a minute, miss a medal. Why settle when you can have it all . Soccer to wrestling. Track and field to basketball. All you have to say is, show me, and boom its on the screen. From the bottom of the mat, to the couch where you at . Show me the latest medal count . Xfinitys where its at. Welcome to it all. Comcast nbcuniversal is proud to bring you coverage of the rio olympic games. For the second time in 24 hours, a man was hit and killed at a northwest d. C. Intersection. This time police say the driver didnt stop. The crash was early this morning at New Hampshire avenue and m street northwest. News 4s Darcy Spencer is at the scene with the concernsf people who work nearby. Darcy . Reporter well, doreen, this is the intersection where it happened. The man who died here was a bartender and waiter at a bar right here in d. C. I spoke to his boss earlier today and described him as a fantastic guy and a great employee. When i spoke to people who work in this area about the incident here, they ptolemy they are not surprised. That intersection New Hampshire avenue and m street northwest where a popular bartender was killed and marcus kelly who works in the area says something needs to happen. Maybe they could have the crossing guards like i see times i see down by the nats stadium. Maybe Something Like that may help. Its a pretty bad intersection Reporter Video of the bright blue striking car is dark, but right now its the best chance that d. C. Police have of finding the driver who struck and killed morning. That pedestrian, david narvellas was 29 years old and lived in arlington. Police released the video taken from a surveillance camera and two pictures as they tried to find the car. Got to be accountable for it, you know. Go to jail or something because its not right. Reporter it happened at an intersection that many we spoke to describe as dangerous with heavy traffic, bikes and pedestrians all sharing the road. When i walk to work, thats the way i walk so we were talking about that in the office. It could have been any of us which was like pretty scary, you know. Reporter its the second Pedestrian Fatality in two days in d. C. There have been five so far this year. Thursday a popular Restaurant Owner was hit and killed and that driver stayed on the scene. The district is working toward a goal of having no traffic fatalities by the year 2024. Its called vision zero. Now if you recognize the car in that veins video youre asked to back to you. Darcy, thank you. First 4 Traffic Alert for those who drive in alexandria. Theres a new red light camera you need to know about. Its been installed at duke street and west taylor run parkway. It will be turned on monday. It will only send warning notices for the first month. There are five active cameras at three other intersections in the city. Red light tickets in alexandria coming with a 50 fine. The Washington Monument is going to be closed for at least ten more days, this after a series of elevator problems. On wednesday a cable broke causing the elevator to stop up near the top of the monument. The elevator broke down twice over the weekend. Today the Park Service Said staff and technicians will do a thorough evaluation of the elevator and a new elevator control system is in the works. Well, for the past two weeks weve seen some incredible competition amid the stunning backdrop of and our wendy rieger has brought us some of the best sights and sounds from the city and joins us from olympic park with what she will remember the most from three weeks in rio. Hi, wendy. Reporter there. Imagine how lucky it is one feels to be able to live in rio for three weeks. This is a sexy city. Its a fabulous city and i had an all access pass. Rio can be a feast for the eyes. The best place to see it from christ the redeemer on corcovado. Im lucky enough to have been here twice. It is a wonder to be in the shadow of this icon and to see just beyond the reclining body of rios shores. This magical moment presented itself on the celeron steps created by a chilean artist and i love that its organic. And as i climbed higher discovered this musician providing the perfect accompaniment. The boss nova seems to perfume ones experience in rio. You hear the soft rhythms in your head, at the beach or at ipanema where i came upon the composer forever following that girl down the beach and finally i must tell you of diogo, one of the nbc bodyguards. One week he was covering the Victoria Secret models who had come to the olympics. Then we heard he was assigned to Matthew Mcconaughey who was visited. Then we heard he was assigned to Matthew Mcconaugheys wife who is brazilian and visiting and then we saw pictures of diego with the socalled melon woman, famous for her round posterior, so, as i leave rio, i know its good to be yes, indeed, it is. Diego was assigned to my party for about two hours, just long enough for me to go homina, h ho mina, homina and then he was gone and its like wheres diego, and they are like diego is off with Matthew Mcconaughey and its like really in hes with the victorias secret model, really . Not that the other body guards werent lovely. You couldnt compete. Reporter diego is one of the official sights of rio. Well get diego on your flight back on monday. Were going to make that happen. Wendy, great stuff. Your lips to gods ear. Cant wait to see you. See you later tonight. Still ahead, a woman out for a test drive and then, yikes, this happened. What we know about the moments before this ci car dealership. The sticker shock on this lifesaving drug for parents of children with severe allergies. First home preseason came for theedskins to rni we made it. Like this favorite. Salmon with tomatoes and capers. Made fresh, every day. Its ready to cook. Just pop it in the oven and put it on your plate. No prep. No cleanup. Delicious, fresh, easy. Wegmans ez meals. Fios is not cable. Which means we can fix things differently. Thanks for calling fio