New Delhi, May 1 -- In a bomb scare of unprecedented scale, over 130 schools in Delhi-NCR received an identical threat email on Wednesday claiming that explosives had been planted on their premises, triggering massive evacuations and searches as panic-stricken parents rushed to pick up their children. "Nothing objectionable" was found during searches by authorities which later declared it a hoax.

Officials said that the initial probe suspected a "deeper conspiracy" by a terror group during the Lok Sabha elections, adding that there is suspicion that the threat mail was sent by an ISIS module.

The Delhi Police's anti-terror unit special cell has traced the domain of emails to Russia and it is suspected to have been formed with the help o...