1 killed after driver rams 5 people with car following altercation in San Francisco

SAN FRANCISCO -- One person was killed after a driver in San Francisco got into an altercation with five people, swung an ax at them and struck them with his car before fleeing the scene, a witness said.

The crash happened around 10:25 a.m. in an area that's mostly warehouses. San Francisco police said the driver of the vehicle was involved in some type of physical altercation with a group and then struck five people before fleeing.

A witness at the scene said the driver first wielded an ax, swinging it at the group. The driver then got into a van, rammed the vehicle into the group and sped off. Police have not confirmed that witness account.

Four people were taken to a local hospital with life-threatening injuries. At least one of those victims died.

Authorities said they arrested a man named Mark Dennis in connection with the crash. He had a white GMC Safari van that was recovered at the scene with several "suspicious dents."

The incident was under investigation.