A 60-year-old man is in critical condition after a suspect riding a beach cruiser bike apparently punched him in the stomach for no reason in the Tenderloin Monday night, causing him to fall and hit his head on the concrete.
The stunning incident was reported at 9:51 p.m. in the first block of Turk Street, Sgt. Danielle Newman said.
"The suspect rolled up, never got off his bike, punched the victim in his chest and then rode off," Newman said.
Officers said the man's head was bleeding when they arrived on scene. He was transported to San Francisco General Hospital with life threatening injuries.
His identity has not been released. The suspect was described only as a man in his mid-to-late 20s wearing black clothing and riding a black beach cruiser-style bicycle.
Police are still investigating whether the suspect and victim knew each other, Newman said.
Investigators canvassed the area for surveillance video and are asking any witnesses to come forward. Those with information should call the Police Department's anonymous tip line at (415) 575-4444 or text a tip to TIP411,with "SFPD" in the message.