11.   Owens and McMullen both described popping noises.

12.   People on the ground in a suburb not far from the airport also saw the flames and heard popping noises, and they alerted police and airport authorities.

13.   Once Stanley is declared dead, Marable is asked about the popping noise.

14.   Several employees reported hearing a loud popping noise Wednesday just before the gas was released at a loading dock at Solkatronic Chemical.

15.   Several employees reported hearing a loud popping noise Wednesday just before the gas release, which occurred on a loading dock at Solkatronic Chemical.

16.   That way, you can get a good flash, good smoke, just a popping noise and nothing to fly out.

17.   A large airliner could be seen parked on the airstrip from where the loud popping noise of guns being fired could be heard.