shooter down. he ran around for while with a leg wound returning fire. reporter: witnesses are crediting the bravery of the officers with saving countless lives. it was the capitol police that saved us all. if it wasn t for the capitol police, i would assume that everybody would have been killed this morning. reporter: a total of four victims were shot including congressman scalise, lobbyist matt mika, staffer zach barth, and crystal griner. i watched steve scalise lay motionless on the field wondering if he was going to be okay. that s a picture i ll never forget. reporter: the hail of gunfire evident in bullet holes in the cmca building. investigators try to find a motive and two members of congress are pointing to a conversation they had with the shooter earlier this morning in a parking lot. he asked me if this team was