San Francisco police say at 9:10 p.m. a motorcyclist struck several pedestrians who were crossing Market in the crosswalk.
Witnesses say the motorcyclist was speeding, traveling up 3rd Street onto Market.
Witness Surya Bhupatiraju was just feet away when his friend was hit. He told ABC7 News, "The motorcyclist just kind of jumps onto the curb. He's going like 30-40 mph, jumps on the curb, hits our friend, she falls face forward, and then he comes and he hits the newsstands here and in doing so, he hit someone else."
Bhupatiraju said it all happened so fast.
Police say four people were taken to the hospital, which included one with life-threatening injuries.
Witnesses say the motorcycle rider was among the injured.
Anyone with information is encouraged to contact the SFPD Anonymous Tip Line at (415) 575-4444 or text a tip to TIP411 with SFPD at the beginning of the message.