The London Bridge has been shut down after a van mounted the curb and ran down several pedestrians, according to a BBC reporter who witnessed the incident.

Holly Jones, a reporter for the network, said the van was being driven by a man and was “probably travelling at about 50 miles an hour.”

“He swerved right round me and then hit about five or six people. He hit about two people in front of me and then three behind,” Ms Jones told the BBC News Channel.

Five or six people were being treated for injuries after the vehicle mounted the pavement and hit them, she said.

“I’d say there are about four severely injured people. They all have paramedics assisting them at the moment.”

London’s Metropolitan Police confirmed on social media that the department is in the process of investigating, but would not comment directly on what happened.

One witness told CNN that he was on the bridge when a van swerved down the road at “high speed,” hitting several people:

The van hit several people, knocking one person about 20 feet into the air, he said. It swerved into oncoming lanes before hitting a bus stop and coming to a stop, Roberts said.

“Within my line of sight, there were five or six people on the ground that were not moving,” he said. “It looked to me that the van was aiming at the people.”

This is a breaking news post that will be updated.