An overloaded minivan collided with a truck in central China on Thursday, killing 13 people and injuring three, traffic police said.

The van, which had a maximum capacity of nine passengers but was carrying 16, hit the rear of the truck while on an expressway in Henan province at 2:40 am (1840 GMT), the traffic management bureau of China’s Ministry of Public Security said on social media.

It was driving on the G40 expressway in the city of Nanyang when it “rear-ended a semi-trailer truck travelling ahead of it”, the bureau said on the Weibo social media platform.

The ministry said it “attached great importance” to the incident, “immediately dispatching a working group to Nanyang led by a traffic management bureau official to direct investigation and handling work”.

Deadly traffic accidents occur frequently in China due to lax safety standards and widespread disorderly driving.