The San Francisco field office of the Federal Bureau of Investigation is asking the public for help identifying a white van tied to the shooting of two Federal Protective Service officers at the Oakland Federal building. 

The FBI released photos of a white van, identified as a 1997-2002 Ford E-250 or E-350 Cargo Van, they believe was driven by people involved in the shooting. Investigators say the van appeared not to have license plates at the time of the shooting, around 9:45 p.m. May 29.