Six people were killed and seven injured when a truck ran over a group of people dining outside near Rotterdam on Saturday night, according to a report released by Dutch police on Sunday.

“We now have six people dead and seven injured, one seriously, after yesterday’s accident,” police spokeswoman Mirjam Boers said.

“We are still investigating to find out what exactly happened,” he added. Police initially ruled out the terrorist lead.

A tow truck crashes into a group of people

A first evaluation of the accident that occurred on Saturday night in Zuidzijdsedijk, about 30 kilometers south of Rotterdam, reported at least two deaths and several injuries.

Police say the tow truck veered off the road and struck a group of people attending a barbecue hosted by a local skating group.

The driver of the truck, registered in Spain, was not injured. He was arrested and taken into custody.

Mirjam Boers confirmed that the driver “was not under the influence of alcohol”. The police have asked for witnesses to help investigate him.