15th and isherwood streets. what are you hearing? >> reporter: jim, look down the valley. you can see the evidence man down here. police say they found three teenagers shot and wounded in this alley. the teenagers were described as students. they say the injuries are nonlife-threatening. they say this happened sometime around 3:30 after school was let out. now, police flooded this area. they're talking to the victims but so far they don't have a motive, they don't have a suspect, and they're not even sure that this is the scene where the teenagers were shot. now, we're also told police have converged on an accident at 21st and e streets -- i'm sorry -- 21st and i streets northeast. it's unclear as to whether that accident is related to the shooting here. but a lot of police are over there investigating it, and this is still going on. we veal more coming up later in the show. now back to you. >> all right. thank you, pat.

that multimillion dollar mansion that burned to the ground in annapolis yesterday has now collapsed. crews are bringing in heavy equipment to aid in this ongoing investigation. a huge crane will be used to dig through what is left of that home. six family members are still unaccounted for. relatives believe they were inside the home when it burned. a team of federal investigators are on the scene and coming up at 5:30 darcy spencer will explain why they are handling this now as a crime scene. surprising new details tonight about the capture of a tech entrepreneur in loudoun county. northern virginia bureau chief julie carey has learned it was the suspect's own mother who tackled him after police tell us he killed his ex-wife's new husband. julie was in court today as minh nguyen faced the murder charge against him. >> reporter: minh nguyen once founded a prefacebook social network but now he's an accused killer.

he was arrested last thursday night after breaking into his ex-wife's ashburn home and kill herg newlywed husband corey mattison. mattison's widow tells news4 the family believes her husband lured nguyen out the back door of the townhouse to get the gunman away from two children inside. >> he was my hero way before a few nights ago, and the one thing more than anything is that he loved being a daddy. >> reporter: now news4 has learned it was the accused killer's mother who helped capture him after the shooting. these search warrant documents reveal as deputies responded to the scene they discovered mattison lying in the garage area. the investigator write, "a suspect later identified as minh nguyen, was observed being held down by a woman later identified as his mother. they were struggling for control of the firearm and nguyen's mother told deputies to get the gun." they were able to grab it and arrest nguyen. this neighbor told news4 he heard the suspect's mother yelling at him. >> i came outside and the mom

was yelling screaming, you should have stayed away from him, i told you to stay away, why would you do this. >> reporter: the next day at nguyen's home another gun and cartridge shells. he has a bond hearing set for january 28th. in leesburg, virginia, julie carey, news4. jo coming up at 6:00 what court records reveal about a possible motive for the murder. a developing story out of baltimore causing some shock waves that dip into the carolinas. a judge dismissing charges in a high-profile murder. the murder of phylicia barnes. that ruling comes two years after michael johnson was convicted of second-degree murder but was granted a new trial based on the prosecution withholding evidence. the second trial ended in a mistrial. barnes disappeared in 2010 while she was visiting her sister in baltimore. her body was found several months later in the susquehanna river. prosecutors plan to appeal the judge's decision. a scary scene on as.

now police are hoping the public can help. metro transit police say this guy got off the x-2 bus on h street last night, turned around and fired a gun into the bus, hitting two people. the woman in the picture was traveling with him. police want to talk to both of them. two men were injured in that shooting. both are expected to be okay. there were about 40 passengers on the bus at the time. we are less than four hours away now from the president's annual address to congress and the nation. much of what he says tonight may sound familiar to you. the president has spent the last week laying out some of his major proposals. but what is the potential impact of those ideas in our area? news4's chris lawrence is live on capitol hill with more on that part of the story. chris? >> reporter: well, jim, if you look at our area really, has one of the largest gaps in income of anywhere in the country. so really we are ground zero for the argument for and against what the president is proposing.

here's basically what he's laying out. he wants to give some tax breaks to the middle class specifically about a $500 credit for married couples and raising the dependent child care tax credit to $3000. that would be welcome for a lot of families here who are struggling with the cost of daycare. he also wants to pay for two years of community college, again, very beneficial for those who are really hurting at the thought of trying to pay for college in this area. how's he going to pay for it? basically he wants to raise the capital gains tax raise other taxes on the so-called wealthy. we spoke to some virginia republican who is say when you look at the cost of daycare, the cost of housing in this area, how he defines wealthy say $500,000, they say it doesn't really apply here. >> we can't be putting hundreds of billions of tax increases on job creators and hardworking family, hardworking small businesses. that's just not going to work.

>> reporter: representative come comstock says she does support raising the dependent child care credit. coming up at 6:00 we'll get more into these proposals how they could affect you. we'll also hear from some democrats out in maryland as well. live on capitol hill, chris lawrence, news4. president obama is walking into tonight's speech with some good news when it comes to his job approval. a new nbc news and "wall street journal" poll finds that 46% of americans approve overall of the job that the president has done. that's his highest rating since october of 2013 when the government was shut down. when it comes to his handling of the economy, the president's approval is even higher 49%. the last time it was that high was his first year in office. but over on capitol hill, congress is still losing this just 16% of americans approve of

the job that lawmakers are doing. redskins making a big move tonight hiring joe barry as defensive coordinator. he most recently served as the chargers linebackers coach. the 44-year-old ran the defense of the detroit lions two seasons and he has a connection to our redskins, working with jay gruden and bruce allen down in tampa. we're awaiting word from the team on when barry will be formally introduced. we have a lot of frustration today from d.c. council members demanding answers from metro about last week's deadly underground emergency. our transportation reporter adam tuss is at the live desk. >> council members asked questions but most remained unanswered. the reason the ongoing federal investigation. there are a lot of questions about last week's accident that killed one person and sent dozens to the hospital when smoke filled a tunnel and train at l'enphant plaza. but metro board chairman says he's bound by confidentiality rules as the national transportation safety board

investigates. among the questions today, what needs to be changed after the episode. he simply said he can't come to a conclusion on what needs to be fixed. he also couldn't speak about the emergency response. and when asked about the concern for rider safety during the investigation, he said metro is committed to acting on ntsb recommendations. after the public session, for a clowed-door meet, a congressional hearing on the accident scheduled for late tomorrow afternoon. lawmakers hope to get more answers then. with metro just days into the investigation of the deadly accident on the yellow line, now the transit agency is considering a fare hike and cutting service. local dogs poisoned by what they're finding on the ground. an arlington neighborhood taking action to stop it. and in news4 your health -- >> we are seeing incident where is patients are up and active and getting range of motion faster. >> 3d printers are used for everything from creating car

parts to iphone cases. now some doctors are using them to heal knee pain.

technology has improved our lives, in small ways. in big ways. but what about this? couldn't this be better too? at redfin we asked ourselves the same question. which led us to create new ways to take you inside a home or instantly schedule a tour. but we paired that with our own agents who aren't paid on commission but on your happiness. and that's what makes it all work the world has changed and now real estate has too. as metro deals with the deadly accident they want to raise fares and cut service. metro tells us the possible

changes would mean less money kneed from jurisdictions that help pay the transit agency's operating budget. we've seen 3d printers being used to create all kinds of things. now some doctors are using them to treat a common medical condition. >> doreen gentzler has details on how 3d printers are being used to heal knee pain. >> reporter: this is so interesting. nearly 5 million americans have had total knee replacement surgery and there's no doubt these procedures have helped a lot of people live without pain but a lot of times they're still dealing with a limited range of motion in that knee. now some doctors are creating a new type of implant that's giving people the movement they need to do the activities they couldn't before. 72-year-old christina starr says dancing is what keeps her feeling vibrant. >> it's like brushing my teeth every day. every day i take class. it really keeps me alive.

>> reporter: but a few months ago doctors told her she might have to retire her ballet shoes. her knee could no longer handle those pirouettes and plies, the result of an consistent nearly six years ago that demolished the ligaments in her knee. sheed been getting cortizone injections but they stopped working. and a traditional knee replacement wouldn't give her the range of motion that she needs to dance. >> the impact that they had that will prevent you from turning and twirling and twisting. >> reporter: determined to continue dancing, christina searched for an alternative and when she got her fourth opinion she got some hope. >> a large portion of the population has had knee replacements say it doesn't feel normal to them. >> reporter: an orthopedic surgeon with the washington joint institute. he says traditional knee implants have helped millions of people but since they only come in a fewurgeon must make it fit into the patient's

knee and that can limit motion. so instead this doctor is creating what he calls patient-specific implants meaning the replacement joint is custom made for each patient. >> what we're looking at with this particular design and this type of implant is to create that implant or create that knee replacement that really feels more natural. >> reporter: to make the implant patients undergo a c.t. scan that takes extensive measurements of knee joint. >> looks at t to back, side to side, and really looks at all the principles and the way it moves. >> that scan is sent to a manufacturer who uses a 3d printer to create a mold of the knee, which is then used to cast an implant that should be an exact match to the patient's own anatomy. right now, there's very little research on these patient-specific implants. but the doctor says he's seeing big improvements for the patients he's treating. >> we are seeing these incident where is patients are up and active and getting range of motion faster than --

>> reporter: christiena starr says she was back to the ballet bar just six weeks after her surgery and her pirouettes feel stronger than ever. >> oh my god. i was so excited. what a miracle. >> it's made a huge difference in her life. and if this suspect amazing enough, listen to this -- health insurance is covering this type of knee replacement, even though it does cost more. doctors hope this same technology can be used for other types of joint replacements including things like hips and shoulders. jim and wendy, this is an idea with a lot of potential. >> oh, beyond cool. what times we're living in doreen. >> this may help when we need our knee replacements. >> exactly. i'm taking notes. >> which is like a month from now. >> thanks,

. one man is dead this morning after a shooting. the police are looking for a suspect and a motive. tonight residents in one of the most pet friendly counties in our region are changing their dog-walking habits. they tell us they think someone is poisoning their pets. news4's david culvert is live in north arlington to explain what's going on. david? >> reporter: well, jim, we spent much of the day in this neighborhood. notice folks are keeping their dogs on a little bit tighter of a leash a shorter one, hoping that their canines don't pick up what this sign is potentially poisonous treats. ever wonder what your dog sees while on a walk? 2-year-old moezey givingabbed him inside this alexandria apartment complex. this happened early this morning inside a build eight long south 28th street not far from schurrlington.

investigators have not released any details about a possible suspect or motive, but police do say they don't believe there's a threat to the public. just a couple of hour, people in alexandria can join a conversation about the relationship between law enforcement and the public. the mayor is hosting the town hall at 7:00 tonight at the durant center on cameron street. the city's police chief, sheriff, prosecutor, and public defender's office will all be there to answer questions. our northern virginia bureau chief julie carey will moderate the event tonight. it's the number-one crime in the county, but it's also the most preventable. that's the message prince george's county police are trying to send to drivers at gas stations this morning. officers handed out flyers reminding everyone to lock up when they pump their gas and hide your valuables even when you're standing next to the car.right, and i think as his mom i still have to, you know, be his mother. >> now, the wizards they will host the oklahoma city thunder tomorrow night at the verizon center. >> yes. >> you know fans around here,

basketball fans, sports fans they want to see kevin durant come home free agent in the summer of 2016. >> he hears the talk and we all hear it, but he doesn't allow himself to be overly concerned with that because the time is not now for him to make that decision. so right now he's just focused on this year. >> when the time does come, i'm sure he will confide in you, get your thoughts or will he? will you leave him alone and make that decision on his own? >> well, in the past i would probably encourage a discussion but now i'll just wait for it. hopefully he will talk to me. i'm quite sure that he will. but i'll just kind of sit back and wait. >> which way are you looking? >> i want my son to be happy. i want him to be in the best place for him. >> directly from the real mvp, wanda pratt. thank you so much for joining usd. powell says he sees a therapist and still suffers from back injuries. photos he provided were too graphic for tv. his message -- before you really go into it.

>> reporter: powell says he's still a member but has decided to distance himself from the group. reporting in prince george's county, zachary kiesch, news4. >> a statement was released this afternoon saying while the university was not named in the lawsuit it does not condone or tolerate any incident of hazing or abuse and takes accusations seriously. now to the fire that gutted a small apartment complex and could have ended in a tragedy if a passerby hadn't jumped into action. that fire along oak street in northeast just a short distance from the university. >> reporter: with the roar of a blow torch the flames shot out the windows of this apartment house on oak street northeas ♪ i finally found the right snack ♪ ♪ ♪