A worker at the unit, Manki Kumar, a resident of Bhagwanpur village in Siwan district of Bihar, was arrested after his voice matched with that in the call recorded at the Police Control Room.

The Mohali police handed over the man, in his early 30s, to the Chandigarh Police, which booked him under Sections 506 and 507 of the IPC.

“During preliminary interrogation, the caller confessed to making the call and said it was just a mischief to get a leave from the factory as he presumed the hoax call would make the police evacuate all industrial units as well,” said a senior investigating officer, adding that further interrogation was in progress to ascertain any other motive behind making the call and to find out the previous track record of the caller.