Rescuers digging through mud and debris have found a further 27 bodies, many of them children, after a flash flood swept through a packed Chinese primary school, state media said on Sunday. At least 91 people are now known to have died in Friday's disaster in which a wall of water and debris smashed into the school near Ning'an, in northeast Heilongjiang province. Hundreds of children and more than 30 teachers were inside at the time. Of the dead, 87 were primary school students and four were adult villagers, Xinhua news agency said, adding that more than two dozen people were still in hospital. The flooding, triggered by torrential rain, caused damage in seven villages near Ning'an city, knocking down 55 houses, the agency said. A report of Reuters said Heilongjiang Governor Zhang Zuoji had traveled to the site, about 450 km (275 miles) from the provincial capital of Harbin, to help coordinate a rescue and relief force of 1,400 people.