Updated

The bank of a rain-swollen river collapsed early Thursday in southern China, flooding 11 villages filled with sleeping people and causing an unknown number of deaths and injuries, the government's Xinhua News Agency reported.

The river bank collapse in Fujian province came amid what the government calls the worst summer flooding in parts of China in three decades. At least 55 people have been killed in Fujian and two other provinces since late May from heavy rains that have caused floods and landslides and washed away part of a rail-link between Beijing and Hong Kong. Twelve people are missing.

Fujian's Changting county saw more than 3 1/2 inches of rain in two hours, sending the Bashili River over its banks and sweeping through the 11 villages around 3 a.m., Xinhua said, citing provincial flood control officials.

Some 3,500 families lived in the villages, parts of which were covered in 2 yards of water, the report said.

"Most of the people were asleep, so there's no way to calculate the number of casualties and the loss of property," Xinhua said.

Rescue crews, including paramilitary police and fire brigades, helped evacuate more than 16,000 people from the area and were reinforcing the river bank with sand bags, Xinhua said.

Across southern China, at least 378,000 people have been evacuated from Fujian, Guangdong and Guizhou provinces due to floods, the Ministry of Civil Affairs said.

Other provinces further inland and to the north have also reported scattered deaths and flood damage.

The rains have disrupted transportation, flooded streets and required thousands of police and military officers to evacuate residents by boat.

China suffers hundreds of deaths each year in floods during the June-to-August rainy season. This season's first storm arrived unusually early.

Deadly landslides also have occurred when water rushed down mountainsides stripped of trees by decades of farming and logging.