>> two of his detail were shot. one african-american gentleman shot in the leg and i believe he's the one that are brought the shooter down. he ran around for quite a while with a leg wound returning fire. >> reporter: tonight witnesses are crediting the bravery of the officers with saving countless lives. >> it was the capital police that saved us all. if it wasn't for the capital police i assume everybody would have been killed this morning. >> reporter: a total of four people were shot. >> i watched mike run and my fellow member steve scalise lay motionless on the field, wondering if he was going to be ok. that is a picture i will never forget. [ grufr ] >> the hail of gunfire evident as far away as the ymca building. tonight as investigators try to