Thiruvananthapuram international airport was placed on high alert on Thursday morning after a bomb threat message was found on an Air India flight from Mumbai, prompting an extensive security check of the plane before the emergency was later withdrawn. (Pic/PTI)

The Delhi Fire Services on Sunday said that two city hospitals and Indira Gandhi International (IGI) Airport received bomb threats through email. Pics/PTI

More than 100 schools in Delhi-NCR received hoax bomb threat emails, causing panic among parents who rushed to schools upon receiving notifications from authorities. Pics/ PTI

Forty-eight private schools in Bengaluru encountered a moment of panic when they received menacing emails hinting at a bomb threat. This unnerving situation led to the immediate alerting of the police by school authorities. Pics/ PTI &amp; Bengaluru Police

On November 13, security was beefed up in Mumbai after a telephone call was received by Bandra railway police station of a possible bomb attack. Sources say, after the call, cops traced the caller and it was found that the call was made from Dubai. However, Mumbai Police advised people not to panic and the crime branch has already started the investigation. Here's a look at recent instances of bomb threat calls in Mumbai which turned out to be a hoax. File pics
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Bomb Threat

Thiruvananthapuram airport put on high alert after bomb threat scare on flight

IN PHOTOS: Two Delhi hospitals, IGI Airport receive bomb threats

IN PHOTOS: Bomb threats spark panic among parents, students in Delhi-NCR schools

IN PHOTOS: Forty eight Bengaluru schools receive bomb threat emails

IN PHOTOS: Recent instances of hoax bomb threat calls in Mumbai

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