Police in Hudson and Pelham alerted citizens last week that skimming devices had been found on gas pumps at different stations. The devices appear like legitimate card scanners, but have actually been rigged to the machine in an attempt to gain the account information as the customer slides the card and uses the personal-identification number to complete the transaction. Dairon Julio Jimenez Roja, 25; Francisco Tamayo Noguera, 35; and Elvis Barban Chavez, 44, also known as Elvis Barban, were first arrested.