A firecracker warehouse exploded in north China's Hebei Province on Sunday, killing at least three people, local government said.

The explosion injured more than a dozen of others.

The accident occurred about 9:10 a.m. in Ningjin County, the government said.

The explosion shattered nearly all the glass windows at a residential building close to the factory. A flour factory located about one kilometer away from the warehouse also had its windows broken.

Investigators are looking into the cause of the explosion, Ningjin government said.