Kansas City police on Wednesday released surveillance photos of a convenience store robber they are calling "Mr. Unknown."
The suspect, who has a black cast or brace on his left arm, drapes clothing over his head to hide his identity during robberies.
Police said he also carries a gold cell phone and sometimes talks on the phone during hold-ups.
Anyone who can help police find Mr. Unknown is asked to call the TIPS Hotline at 816-474-8477. Callers can remain anonymous.