Long Beach police are alerting the public to multiple skimming devices reported over the past several months.

Long Beach police tell News 12 two incidents occurred in March, both at a 7/11.

They say that the patron went in and inserted a card, but it wasn't until the transaction was completed that the person realized a problem.

"When they were done with their transaction and removing the card, the skimming device actually came off," says Long Beach Police Commissioner Ronald Walsh. "It actually partially came off. So, he removed it, went up to the counter and said, 'Hey, you know, the ATM kind of fell apart.' The clerk at the store said, 'No, that's not part of the ATM,' called the police and we responded and started our investigation."

Police say there were no losses since someone has to come back to pick up the device before being able to access the information.

According to police, the easiest way to detect a skimming device is to tug on the area where you swipe your card.

Police say if it is loose, be suspicious.

They say if they suspect something, don't use the ATM and call the police.

Officers will come down and have an investigation or at least let the management know.

Long Beach residents tell News 12 they are already protecting themselves against the crime.

"I basically only use the Chase ATMs and when I go inside and if it's crowded, I go into the bank, so I make sure I'm more safe that way," says Don Harnick.

Long Beach police started a campaign featuring flyers up at locations throughout the city, including at City Hall.

Immediately report any suspected skimming devices by calling 911.