WUHAN - An explosion ripped through a warehouse of a factory in Central China's Hubei province Saturday, local authorities said. The casualties were unknown.

Firefighters work at the accident site after an explosion ripped through a warehouse of a chemical factory in the Dongxihu District of Wuhan, capital city of central China's Hubei Province, April 13, 2013. The casualties were unknown so far. [Photo/Xinhua]

The ensuing fire engulfed the warehouse where thousands of chemical tanks were stored in the Dongxihu district of Wuhan, capital city of Hubei, at about 11 am. More explosions were occasionally heard.

Fire fighters were struggling to put out the fire.