A bus carrying government officials exploded in Rawalpindi, Pakistan, when a rigged bicycle rammed it and detonated. The attack killed approximately five people and injured at least 25 more.

The bus, which reportedly belonged to Pakistan’s main weapon manufacturer, exploded at a main intersection in the city.

“It was apparently a suicide attack as the man on the bike struck the bus head on and exploded,” said Rawalpindi’s police chief, Nasir Khan Durrani.

Rawalpindi sites the headquarters of the Pakistani army.