The caller who identified himself as Mohan called Deputy Commissioner of Police (north east) Basavraj Malagatti and claimed that he had captured a video of the people who had planted the bomb in the aircraft.
Malagatti said that the caller informed that the recording had been converted into a CD and he would hand it over to him in exchange for a suitable reward.
"I got the call at 7.15 pm on my landline number. The caller refused to divulge his complete identity and his phone number.
"When I assured him that he'll be rewarded if he gives me the CD and his phone number, he said he'll contact me soon and took my mobile phone numbers," Malagatti said.
He said that the caller offered to give his bank account number so that they can deposit some money for his associate to fly down to Bangalore with the CD.
"I assured him that I'd give him two and fro charges along with the cash reward if I get the CD and asked him to send his associate. However, he didn't reply to it and disconnected the call," said Malagatti.
Keeping in mind that it could be just a prank, Malagatti has instructed his officers track the number.
"I've asked my officers to track the number as I think he's a prankster. However, we cannot rule out any possible leads."
Meanwhile, the Kerala police have detained few people in Thiruvananthapuram, including a ground staff member of Kingfisher airlines and a scrap dealer and an explosives licence holder in connection with the case.
Recently, three people traveling from Kerala to Dubai via Bangalore were arrested by the Bangalore airport police based on a tip off from Kerala police.