Scooter rider injured in San Francisco hit-andrun

San Francisco police are investigating a collision where a person riding a scooter was injured in what appears to be a hit-and-run.

The incident occurred Sunday night at Geary Boulevard and Larkin streets.

A witness who did not want to be identified said the collision appeared to have started with a suspect trying to escape police, and hit the man riding the scooter.

The witness said he saw "tens of police cars" chasing the suspect. 

No more information was immediately available.