A man who was robbed in a popular Mission District tourist attraction is fighting for his life Wednesday, after his muggers left him seriously injured.

Police say that two muggers in their 20s attacked their male victim at 9:20 Tuesday night in Clarion Alley, the iconic and mural encrusted 15-foot wide, 560-foot-long throughway running between Mission and Valencia Streets between 17th and 18th Streets.

The victim, whom police say was in his 30s or 40s, was left with life-threatening injuries after witnesses say that they saw the suspects hit the man "with an unknown object."

According to the San Francisco Police Department report on the crime, the victim "fell to the pavement" as a result of the attack. While he was on then ground, the suspects rifled his pockets, stealing "unknown items," police say.

The suspects then fled on foot in an unknown direction, according to the SFPD. The victim was transported to SF General Hospital for treatment of life threatening injuries, police say. An update on his condition was not available at publication time.

Despite its popularity with tourists from around the globe, Clarion Alley has recently been the site of numerous violent crimes: A man who was walking home through the alley was shot from behind in November, in August a man was stabbed by an unknown suspect at 8:50 in the evening, and in April a group of apparent robbers approached a man in the alley and stabbed him in the stomach.
Police did not have any additional details on the suspects in Tuesday's case, but confirm that no arrests have been made in the case. As of Wednesday, both men remain at large.

Related: Man Shot From Behind In Clarion Alley