Wells said that once he heard the music coming from the RV, he feared officers were being set up for an ambush and began scanning the tops of buildings and parking garages looking for an active shooter.

"At that moment it felt real and it felt like there was going to be some secondary activity. So every time we came out of a building we made sure that we were looking around and checking high areas, just making sure nobody was peeking around and looking at us," Wells said.

He said that just prior to the blast, he was walking back towards the RV and "I literally hear God tell me to turn around and go check on Topping, who was by herself."

"For me, it felt like I only took three steps and then the music stopped and as I'm walking back towards Topping now, I just see orange than then I hear a loud boom," Wells said.