A group of muggers menaced a shopper at the Westfield Centre Friday afternoon, beating and robbing him as he used the restroom of the tony Market Street mall.

The attack, says the San Francisco Police Department, occurred at 5:15 p.m. Friday, as a 20-year-old man was in a restroom of the retail center located on the 800 block of Market Street, between 4th and 5th Streets.

As the victim washed up, three men in their early 20s entered the restroom, and started punching him "multiple times in the face and body," police say.

The mall muggers then "went through [his] backpack and stole miscellaneous school supplies," then fled.

The victim was injured in the assault, but declined transport to the hospital. As of Monday morning, police say that the suspects remain at large.

This is at least the second time in recent days that the Westfield Mall has been the scene of a violent crime: Just two days before the mugging, the body of Sons & Daughters line chef Frank Galicia was found in a stairwell of the mall, the victim, police say, of a homicide. As of Monday morning, police say that the investigation continues but no arrests have been made in that case.

Previously: Westfield Mall Homicide Victim ID'd As Sons & Daughters Chef