The arrested have been identified as Vishal Aggarwal, Yogesh Gupta, Prince Pal Singh and Jitender Mishra.
According to police, the incident came to light when the victim suddenly found on September 13 that his mobile number was not operational. Four days later, he got the SIM active again and found a text message from his bank that "his request for loan of Rs three lakhs has been accepted."
"He had not sought any loan. He found from bank that Rs six lakh were transferred from his account to an account of one Rahul without his knowledge and consent through Net Banking," said Chhaya Sharma, DCP (South).
During investigations, it came to light that the money was transfered into a salary account of a private company in Noida but they informed police that there was no Rahul in their payrolls and they have not allowed anyone to open this account.
Police also found that Rs six lakh were already withdrawn through various ATMs immediately after the transfer of money.
"All the documents along with CCTV footage were collected from various places and Prince Pal Singh's name emerged. He had opened the account in the name of Rahul using his own photograph," Sharma said.
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Police traced Singh and his interrogation led to the arrest of others.
Mishra allegedly provided information about the account of the Colonel to others.
"After obtaining the information of the account holder, Aggarwal used Facebook and other social sites to obtain the photograph and other details of account holder. Thereafter he prepared a forged ID and applies for the new SIM card for the number used by the account holder.
"As soon he got the new SIM of account holder, the original SIM automatically got blocked. After this, Aggarwal used to transfer the money from the account of victim to the fake account of Rahul through net banking," police said.