SNELLVILLE, Ga. -- Five teenagers face felony charges after being arrested on suspicion of making and detonating up to 10 bombs in the backyard of a house in Snellville, Ga., about 25 miles east of Atlanta, WSB-TV reports.

Snellville Police Det. Jim McDonald said the teens, ages 16 to 19, had made the small bombs using water bottles, bathroom cleaning fluids and aluminum foil.

He said officers found the remnants of 10 exploded devices in the backyard of the house.

"The container expands and pretty much just blows up," McDonald told the station.

Officers had surrounded the house with guns drawn after a neighbor rang police fearing someone was being shot.

The five teens face felony charges for possessing and manufacturing destructive devices, while two parents at the house will be charged with unruly conduct after telling police they thought the teens' bomb-making exploits were "harmless fun."