Cambridge Police are looking for a group they say installed "skimmers" on ATMs in Central Square to capture customer bank information.
Police say the skimmers were in operation between November and January - and that the group "extracted an undisclosed amount of cash from the compromised accounts in New York City" two weeks ago.
Police have released photos of the men suspected of installing the devices, which collect data from their bank cards to be imprinted on blank cards.
Police say they've stepped up surveillance of local ATMs.
Although the devices are now sophisticated enough to escape cursory examination, police offered some tips:
Inspect ATMs, gas pumps or credit card readers before using them. Be suspicious if you see anything loose, crooked, damaged or if you notice scratches or tape residue.
- When entering your PIN, block the keypad with your other hand to prevent possible hidden cameras from recording your number.
- If possible, use an ATM at an inside location.
- Be careful of ATMs in tourist areas, as they tend to be popular targets of skimmers.
- If your ATM card is not returned after a transaction or after hitting cancel, immediately contact the financial institution that issued the card.