The duo used to steal cheques from drop boxes of the bank and later copy their signatures on a white paper using a technique with the help of a kerosene, Palasia police station in-charge, Shivpal Singh Kushwaha said.
The duo were identified as Satish Maratha (30) and Santosh Malviya (30), he said.
After copying signatures on a plain white paper, they used to apply for issuing new cheque books and also request the bank to change the mobile phone number of the account holder with their own number so that the customer could not receive any SMS alert, the official said.
A police team was constituted six months back, following a complaint from the customers that someone is withdrawing money from their bank accounts fraudulently, he said.
Maratha and Malviya admitted that so far they have withdrawn Rs 20 lakh from eight bank accounts, police said.
They were arrested under IPC section 420 (cheating), 67 (forgery of valuable security), 468 (forgery for purpose of cheating) and 471 (using as genuine a forged), he added.