Kathmandu (AFP) - At least 20 people were killed and 11 missing after a bus skidded off a mountain highway and plunged into a river in Nepal, police said Thursday. The bus was en route to Kathmandu from a village in the northeast when it plunged 40 metres (130 feet) into the Bhotekoshi River. There were around 35 people on board, police said. We recovered 12 bodies from the river downstream and eight from the wreckage of the bus. Another 11 are still missing, said police inspector Abhaya Joshi who was involved in the rescue operation. Four people were rescued and undergoing treatment at a nearby hospital, he said. The police officer said the chances of finding more survivors looked slim. The missing people might have been swept away. We will continue searching on Friday, he told AFP by telephone. The bus was speeding and the driver apparently lost control, causing the accident, police said.