A man is fighting for his life after an early-morning assault yesterday in the Inner Richmond left him with serious injuries.

The incident occurred just before 6am on the 4000 block of California Street between 2nd and 3rd avenues when an unknown suspect struck a 55-year-old man who was lying on the sidewalk with a bicycle lock.

The suspect, who was not arrested, fled the scene, and the victim was transported to a hospital with life-threatening injuries.

Anyone who has information about this incident is encouraged to contact SFPD via the department's anonymous tip line at 415-575-4444, or text TIP411 with "SFPD" at the start of the message.

Here’s why we usually don’t include suspect descriptions in crime reports.