Oakland police told the media that Quan was involved in the crash at a West Oakland intersection Sunday evening.
A statement from the mayor's office says it was a two-car collision and it appears another vehicle hit the back of Quan's car. The statement says "the mayor is unharmed and we're hopeful that no one else was injured either."
Witnesses including the other driver tell KRON-TV that Quan was talking on her mobile phone and wasn't paying attention before the crash.
Reached by phone, the mayor told the TV station the collision wasn't her fault and it's clear from her car that she was the one who was hit.
"This evening I was driving between two community events in West Oakland when another vehicle struck my left-rear tire," Quan posted on Twitter Sunday night. "Police are investigating what led to the collision and I'm going to let them do their job and report out the details."
"I am also submitting my phone records to the investigators, which will confirm that I was not on my phone at the time," Quan tweeted later.
This evening I was driving between two community events in West Oakland when another vehicle struck my left-rear tire.— Jean Quan (@jeanquan) June 9, 2014