Brian Ellis, 40, whose last known address was in the 300 block of Lynn Street in Manteno, was charged with one count of felony robbery of the Palos Bank and Trust branch at 15801 S. Bell Rd.
Authorities say Ellis went into the bank just before 5 p.m. Wednesday and handed a teller note announcing a robbery and demanding money. He said he was armed with a handgun, but no gun was shown and no injuries were reported, according to the FBI.
After taking more than $7,000 in cash, Ellis left the bank, authorities said. The bank security guard, an off-duty Elmwood Park police officer, saw that the teller was upset and learned that she had just been robbed. He chased after Ellis and caught up with him a few blocks away, authorities said.
There was a struggle, but the officer was able to handcuff Ellis, the FBI said.
If convicted, Ellis could face up to 20 years in prison.