by: Tina Terry Updated:
CHARLOTTE, N.C. - Charlotte-Mecklenburg police are searching for clues in a bizarre string of robberies.
Police said the man used a Halloween mask of Frankenstein's monster to rob several gas stations early Thursday morning.
Surveillance pictures show the man dressed in black and carrying a handgun. He robbed gas stations on WT Harris Boulevard, Mallard Creek Road, The Plaza and Albemarle Road between 2:50 and 4:20 a.m.
Police said Thursday afternoon that they believe the man is also behind three other robberies from earlier this month.
In those cases, the suspect took his shirt off and tied it around his face.
"We own a business here. We gotta worry about what's going on," said Steven Karanik, co-owner of Lil' Prix Tattoo and Piercing on WT Harris Boulevard.
The owners said they wonder what could happen if police don't find the serial robber soon.
"Sometimes we're open later than usual. Anybody can walk through the door," said James Vanhoff, co-owner of Lil' Prix Tattoo and Piercing.
In another gas station robbery earlier this month, police said the suspect walked inside, fired his gun twice and ran out without stealing anything.
They are offering a reward of up to $5,000 for information leading to an arrest. If you have tips call 911 or Crime Stoppers at 704-334-1600.