it was caught on camera. 0 a warning the video you are about to see is disturbing. reporter: revolutionary fighters advancing through sirte. the commander sees movement in the distance. he calls for one gunman to fire. the rest of the unit joins in, shooting wildly. they come under fire. [ gun fire ] an ambulance is hit by a rocket-propelled grenade. they and we are caught in the open. a pot shot. something in the distance. fightered opened up and there was some return fire. cnn producer was hit. i ve been shot. down, down. down. go, go, go! get down! right side. go to the right side of everything. go, go! that s it. good. other way. we start to check his injury. looks like there is a piece of shrapnel inside. you can feel it? i could feel it. when he was moving around, i could feel it inside. reporter: at a nearby field hospital, medics help ian. while dealing with their own grief. a colleague of these men was killed in the same attack just meters away from w