Victim stripped of his pants in SF street mugging

Police set up crime scene tape on Taylor near Sutter street on Jan. 25, 2015, following stabbing of a man. Police set up crime scene tape on Taylor near Sutter street on Jan. 25, 2015, following stabbing of a man. Photo: Evan Sernoffsky Photo: Evan Sernoffsky Image 1 of / 1 Caption Close Victim stripped of his pants in SF street mugging 1 / 1 Back to Gallery

A 29-year-old man ended up beaten and pants-less after a Mission District robbery early Saturday morning, authorities said.

Around 5:10 a.m., the victim was approached by two men, both in their early- to mid-30s, near the corner of 18th and Capp streets and propositioned for a drink, said Officer Albie Esparza, a police spokesman.

Without provocation, the men began attacking the victim, who fell to the ground, Esparza said. After knocking the victim down, the assailants stripped the man of his pants, which contained his cell phone, wallet, passport and some cash, before fleeing the scene.

The victim, who was not identified, suffered a cut to the cheek and was taken to a nearby hospital, but is expected to recover from his injuries.

Kale Williams is a San Francisco Chronicle staff writer. E-mail: kwilliams@sfchronicle.com Twitter: @sfkale