My guess is that the shooting was either:
1) Recorded and played by the RV - this would attract the cops attention and then they could evacuate the area around the vehicle when the recording shifted over.
2) If the supposed remains are human, the bomber may have committed suicide prior and that was the shooting sounds heard.
1) Recorded and played by the RV - this would attract the cops attention and then they could evacuate the area around the vehicle when the recording shifted over.
2) If the supposed remains are human, the bomber may have committed suicide prior and that was the shooting sounds heard.