India, Sept. 29 -- A wave of panic and extensive security operations swept across the National Capital Region (NCR) on Sunday after more than 300 schools and institutes in Delhi and several airports received bomb threats on Sunday morning, which were later declared a hoax. The threatening emails landed in the inboxes of the institutions at 6:08 am. This simultaneous arrival at over 300 different email addresses highlights the calculated nature of the attack. Police officials have confirmed that the threats were sent by a group calling itself "Terrorizers111." This group has been linked to similar threatening communications in the past.

The email claimed explosive devices had been planted. It chillingly asserted the bombs would be detonat...