A collision between a dump truck and a muni bus killed one and injured six others on the southbound 101 freeway in San Francisco Friday afternoon.

The driver of the truck was fatally injured, while the bus passengers suffered non-life-threatening injuries, said officer Vu Williams of the California Highway Patrol.

“Right now we are working to upright the dump truck, and we completed our investigation and collection of evidence,” said Williams.

A spokesperson for the fire department said two people were transported to the hospital and the remaining four were treated and released at the scene.

The collision occurred just before 4 p.m. north of the Cesar Chavez exit of the southbound 101 freeway, according to the California Highway Patrol.

It’s unclear how the crash happened, but California Highway Patrol officers were on the scene to investigate.

Around 7:30 p.m., CHP posted to Twitter announcing that the truck had been righted and they estimated the lanes would be open in 45 minutes.