Reuters:

"Victims' relatives gathered outside the building to "demand the government investigate and announce the cause of the accident as soon as possible", Xinhua said.

Hong Kong's Phoenix Television cited family members as saying that the doors were always kept locked during working hours during which workers were forbidden to leave and that the slaughterhouse never carried out fire drills.

China's record is poor. Fire exits in factories are often locked or blocked and regulations can be easily skirted by bribing corrupt officials."

Many of China's most deadly industrial accidents happen in the large coal mining industry, in which more than 1,300 people died last year alone from explosions, mine cave-ins and floods.