Authorities are asking for the public's help in identifying the suspects believed responsible for at least four burglaries of pizza restaurants around Houston.

The Little Caesar's Pizza on Imperial Valley is one of the restaurants those crooks have hit. Police say the suspects use a sledgehammer to break through the front glass door and to break into the safe.

"They have been burglarized pretty much every other weekend at their different locations," says Edith Maldonado with the Houston Police Department.

Police say the burglaries occur overnight while the restaurants are closed. In surveillance video from the Imperial Valley location, you can see the suspects break through the glass door and start going to work. They take turns whacking the safe with the sledgehammer while the others rest.

"One of them is constantly on the phone while in the restaurant, we believe he is the one talking to the driver, just making sure that he is looking out," said Maldonado.

When they realize the sledgehammer isn't working, one of the suspects grabs a circular handsaw and saws his way into the safe. Then they make off with bags full of cash.

Police say the men wear dark clothes and always have their faces covered. Watching the surveillance video from the restaurant on Little York, you get a good look at one the suspects' faces as he grabs a crow bar and smashes the camera.

"They are coming in between two or three individuals, so if someone were to pass by and see them it could become a dangerous situation especially since they do have weapons, sledgehammers, crowbars and a saw," said Maldonado.

Now customers like Florence Chisum are concerned and worried what could happen next.

"I don't think I will be coming here for awhile. They are going to be losing business," said Chisum.

Police say there are possibly five total Little Caesar's break-ins to which those men may be connected:

•March 13 -  16282 Imperial Valley Drive
•March 27 - 212 East Crosstimbers
•April 5 - 139 Little York Road
•April 7 - 9855 Blackhawk Boulevard

Investigators are also looking at the possibility of this being a inside job.

The suspects are described only as black males, possibly in their 20s.  They were wearing dark clothing and gloves, and used bandanas to cover their faces.

Anyone with information in these cases is urged to contact the HPD Burglary and Theft Division at 713-308-0900 or Crime Stoppers at 713-222-TIPS.