The death toll from a cargo vessel blast has risen to seven as of late Saturday after rescuers retrieved two more bodies Saturday from a river in south China's Guangdong Province, local authorities said.

Six people remain missing, said a spokesman with the government information office of Guangzhou, the provincial capital city.

The accident happened around 1 a.m. when the vessel, "Nandayou 22," exploded at a dock in the township of Shilou, Panyu District of Guangzhou.

The accident also left one injured, said the spokesman.

The legal representative and the vice president of the Gang'an Ship Cleaning Company, owner of the dock, have been detained, he said.