An explosion ripped through a Pakistani arms depot just outside the capital Islamabad on Monday, injuring three people and bringing down the roof of a barracks, police said.
"It was an accidental blast. An explosive device exploded when a few people were handling it inside an army depot," said Faisal Memon, a senior police official in the area.
"The army has blocked entry to the site," he said.
Another police official said the roof of a barracks collapsed.
"It was a small room being used by army personnel as a residential barracks. Explosives were also stored there, which exploded and injured three," said Basharat Ali, a local police official.
"The injured are being shifted to a military hospital," he said.