More than 20 flights received bomb threats this week, leading to diversions and rescheduling of flights and sending security forces into a tizzy.

An Air India flight from Mumbai to London Heathrow has become the latest target for a string of hoax threats against Indian carriers. Flight AI129 was approaching the Essex coast after a nine-and-a-half flight from the Indian city. It appeared to be descending for a normal landing at Heathrow.

This is the latest in a series of bomb threats received by various airlines on domestic and international routes.