TAIYUAN - Three people were killed and another four were injured in a house explosion in North China's Shanxi province on Wednesday evening, local authorities said Thursday.

The accident happened at about 5:47 pm at a house in Xinjian Street, Fenyang city, a Fenyang municipal government official said.

Illegal storage of detonators contributed to the explosion, according to initial investigation from the police.

The cause of the accident is under investigation.