accelerated gunfire. all coming from the officers. >> you grabbed your iphone and -- >> yeah, i grabbed my phone, and just immediately jumped on to the bed and started taking pictures. >> reporter: andrew kitzenberg crouched in his second floor window and taking these dramatic pictures and saw that escape. so did an eyewitness, named jane dyson from a third floor window. at that moment, she told "the boston globe" and said it looked like an individual had fell to the ground and was hit by gunfire. that would have been a transit officer who was standing right here. at the time he was shot, tamerlan tsarnaev was lying on the street. his brother, dzhokhar, was driving away. only the police were firing. officially, state police tell us the matter remains under investigation. law enforcement sources tell cnn, officer richard donahue was