they will perform ballistics testing to see if the rounds were fired from the suspects gun. >> a firearm was found. a vehicle was leaving the scene, found crashed at 23rd street and constitution avenue. >> reporter: he's been able to elude capture since friday. now, he's in custody in pennsylvania. authorities plan to bring him back to d.c. to figure out why he fired the gun and if he was aiming at the white house. i was able to speak to the suspects mother by phone. she said she had ant talked to him for a couple months. she said in one conversation she tried to talk to him. he said...