"We have arrested one person belonging to a two-member gang for trying to break open the SBI ATM in the wee hours," police told reporters here.
The other culprit was at large and a manhunt has been launched to nab him, police said.
The gang barged into the ATM brandishing sharp weapons when the security man Shabuddin was fast asleep. They woke him up and tied his hands and one of them tried to break open the ATM machine with his helmet and the other, wearing a monkey cap, kept guard outside, police said.
The culprit retaliated by smashing the helmet on to Shabuddin's head, inflicting injuries, police said, adding, the person keeping vigil escaped following the scuffle.
The injured Sandeep, hailing from Jammu and Kashmir, was arrested with the help of people, police said.
He has been shifted to hospital for medical treatment, police said.