HANGZHOU - An explosion ripped through a workshop of a motorcycle parts maker in East China's Zhejiang province Friday night, killing five workers and injuring one, local government said Saturday.

The blast happened at about 8:35 pm Friday at a workshop of Zhejiang Hongwei Vehicle Co. in Dongdu Township of Jinyun County, Lishui City, the Jinyun county government said in a statement.

Three workers were killed at the scene and two died later in the hospital, it said. One injured was still under emergency medical treatment.

All the workers were from the neighboring province of Anhui.

Initial investigation showed the explosion might be triggered when metal dusts met fire.

Local police were further investigating the cause of the explosion.