OAKLAND (CBS SF) -- A BART police officer was allegedly punched in the chest by a suspect who the officer was trying to detain Thursday at the West Oakland station, police said Friday.

The incident occurred at about 8:20 a.m. at the station at 1451 Seventh St. in Oakland.

Police said the suspect, who they identified as 29-year-old Oakland man Virgil Ard, got away but left his wallet with identification inside.

A warrant was being sought for Ard's arrest.