Sketch released of man who attacked postal worker

CHICAGO (WLS) -- Investigators released a sketch of a man they said threatened a Chicago postal worker with a gun.

The U.S. Postal Inspection Service is also offering a $20,000 reward for the capture and conviction of this man.

He's accused of trying to rob the worker in the Hyde Park neighborhood back on September 1.

Surveillance cameras also captured an image of the suspect.

One of the victim's co-workers saw the attack and scared the man off.