Cops said that the accused had cloned debit cards from the ATMs at these locations, and withdrew the cash from ATM kiosks of other banks in Kalyan.

The hackers in the gang use card skimmers to clone ATM cards. These are magnetic strips, which are fixed inside the slot for inserting the card in the machine, and can record account numbers of the cards. The accused also fix cameras in the booths to read PIN numbers of the cards.

The cameras are positioned in such a way that they face the number pads of the machines, so that when the customer types his password, the camera has a recording of it. They would visit the ATMs to install the cameras and skimmers, and collect them later at night.

Police is trying to meet shortfall of security and more stringent techniques to reduce such crimes.