The militant outfit, which seeks a "sovereign Assam," stated that the bombs failed to detonate due to technical errors.

During questioning, it was found that the boy did not want to go to his school the next day so he sent a bomb threat to the school administration using a relative's email id, a police officer said.

A bomb threat led to a Varanasi-bound flight being evacuated at the Delhi international airport.

In three days, Kolkata airport gets second bomb threat. Security finds this to be a hoax too.

The mail threatened that the bombs will explode at 12.55pm on Friday.

The threat mail mentioned that the CM, Deputy CM DK Shivakumar, the home minister, and the Bengaluru Police commissioner are on the target. 

Senior police officials, including Thane city cops, visited the spot where the detonators were found.

Mumbai Police has formed a special team to investigate emails which threatened that bomb blasts will be carried out at multiple places in the city, an official said on Saturday.