Police believe that a makeshift explosive that went off in the underground parking garage of an apartment building on Ocean Park Boulevard Monday night was probably the work of a prankster or student whose science project got out of control.

No one was injured and nothing was damaged in the explosion, which was reported at 8:39 p.m. at 1413 Ocean Park Blvd., said Santa Monica Police Department spokesman Sgt. Richard Lewis.

The device consisted of a capped plastic milk jug with some kind of acid and aluminum foil inside. When mixed together the ingredients produce a gas, much like mixing vinegar and baking soda. The gas builds up pressure inside the bottle until it explodes.

Lewis said the crude bomb was found by a staircase and not under a car or near a doorway.

“Since it was in an underground garage it sounded like a pretty big explosion, but at the end of the day it wasn’t much,” Lewis said.

Two fire engines responded to the scene. Forensics collected the remnants of the device to be processed for evidence. So far no suspects are in custody.

Lewis said depending on a motive, those responsible could be charged with making and possessing an explosive device.

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