NEW YORK (CBSNewYork) — Police want to warn shoppers about using the ATMs at Duane Reade pharmacies.

Authorities say customers should check the ATMs before using them, because skimming devices have been found on machines at three Manhattan locations.

The devices were discovered at 184 Fifth Avenue, 1350 Broadway and 769 Broadway.

Last month, police in Nassau County also found ATM skimmers at several 7-Eleven stores.