SAN FRANCISCO (CBS SF) — An on-duty San Francisco Recreation and Park Department park ranger was stabbed Sunday morning as he tried to help a motorist who had crashed into an Interstate Highway 80 median downtown, San Francisco police said.

The incident started shortly after 7 a.m. Sunday, when the park ranger – in a marked park district vehicle – saw a driver yelling at other motorists, said San Francisco police Officer Robert Rueca. The ranger followed that driver onto I-80, where the driver soon crashed into the center median near the Seventh Street exit.

READ MORE: Berkeley Hills Residents Urged To Stay Elsewhere During Extreme Fire Weather

Rueca said the ranger then stopped to help that driver, but that the driver stabbed the ranger as the ranger got out of his vehicle. Passing motorists stopped to help the ranger and detained the
suspect until police arrived.

READ MORE: Fourth Stimulus Check: Is Another Relief Payment Coming Soon?

The suspect was arrested and taken to a local hospital, Rueca said, for treatment of unspecified injuries. The ranger was treated at the scene for his injuries and released.

MORE NEWS: Dixie Fire Update: Firefighters Brace For 40 MPH Red Flag Winds; Flames Advance Toward Lake Almanor

© Copyright 2019 CBS Broadcasting Inc. and Bay City News Service. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.