. >> reporter: he was traveling with cousin and ray watley and friend tony burney. >> that vehicle traveling that excessive rate of speed was on top of them. >>> i'm andrea mccarran in baltimore at johns hopkins where a gunman opened fire and killed himself and mother after wounding a doctor. moments after a doctor briefed paul warren partis about his mother's condition, police say he opened fire. >> and fired a single gunshot that struck the doctor in the lower chest, upper abdomen. >> reporter: as s.w.a.t. teams surrounded the building, the hospital went into lockdown. >> my boss came running in to tell me to stay put where i'm at, because there is a guy running around with a gun and we don't know what he's going to do. >> reporter: some hospital staffers say partis was angry that his mother's final surgery allegedly left her paralyzed. >>> and that doctor that partis shot has been identified. his name is dr. david cohen and he's just undergone surgery for wounds but police say the injuries are not life- threatening. as for the shooter himself, partis' neighbors in arlington are, as you mi

his cousin and ray watley and friend tony burney were also in the car. police say the suv crossed a double yellow line heading straight toward the ambulance, which had its lights and siren on. >> we respond on an emergency basis to about 130,000 calls per year for our department. we're one of the busiest combination fire and ems departments in the country and we log a lot of road miles on orients and -- and our drivers need to drive defensively and safely. >> reporter: and we're told the district heights station, which is just a couple of blocks away, is the busiest station in the county. the firefighters we're told is a 22 and 27-year-old are recovering at home. they are sore from today's crash. firefighters say they are very proud of them and will offer counseling when they do return to work. we're live in district heights, delia gonsalves, 9 news now. >>> now to some suspected armed robberies caught on tape. but apparently this led to the arrest for an attack near the university of maryland. police hope this video of the suspected robbers trying to us