Four people were killed after two buses crashed into each other on a highway in Anshan, Liaoning province, on Tuesday, according to a report on www.nen.com.cn.

The buses, from the same transportation company, ran into each other at 3:33 pm. Traffic police said the buses were not overloaded or speeding.

Three people were killed on the spot and another died while undergoing treatment. More than 40 injured passengers were taken to hospitals.

The cause of the accident is under investigation.