SAN FRANCISCO (CBS SF) — Police have released surveillance images of a man who allegedly punched an 18-year-old aboard a San Francisco Muni bus and stole his pit bull puppy out of a backpack.

Officers described the suspect as a black male adult, approximately 26 years old, 5-foot-9 and last seen wearing a black cap and a black vest over a gray sweatshirt.

Police responded to 6th and Mission St. on January 22 at around 2:40 a.m. and interviewed the unidentified victim, who said the man punched him in the face and then took the dog out of his backpack before exiting the bus with it.

Anyone with information was urged to contact Sergeant Maris Goldsborough at 415-734-3117, or the Anonymous tip line at 415-575-4444.

People can also text a tip to TIP411 with SFPD at the beginning of the message.