A dramatic and unprecedented surge in hoax bomb threats targeting Indian airlines is wreaking havoc on flight schedules, diverting planes and causing widespread disruptions.

As many as six IndiGo flights received fresh bomb threats on Sunday amid a spate of hoaxes. Here are the details:

More than 30 flights operated by Indian airlines received bomb threats on 20 October, Saturday, sending security agencies into a tizzy and causing hardships to hundreds of passengers as well as staff at airports. The Bureau of Civil Aviation Security (BCAS) held a meeting with CEOs and representatives of airlines in Delhi.