Two would-be robbers knocked a man down on the Mall Monday afternoon and rifled through his pockets, a U.S. Park Police spokesman said.

The incident occurred around 5:15 p.m. in the garden that lies between the Smithsonian Institution’s Arts and Industries Building and the Hirshhorn Museum.

The man was walking through the garden, in the 900 block of Jefferson Drive SW, when two young men in ski masks came up from behind and pushed him to the ground, said Sgt. David Schlosser, the Park Police spokesman.

He said the two assailants rifled through the man’s pockets but found nothing, and fled onto nearby Independence Avenue SW, where they headed west.

The victim suffered minor injuries and was taken to a hospital for treatment, Schlosser said.

He said police were actively investigating the incident.