Two men were arrested and accused of using a Roman candle-style firework to cause an explosion at Harvard Medical School over the weekend, authorities announced Nov. 4.

Two Massachusetts men are in police custody, accused of using fireworks inside a research lab at Harvard Medical School.

“Igniting an explosive device inside a school locker is not some harmless, college prank. It's selfish, short-sighted, and a federal crime,” he began.