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

More than 90 fake bomb threats have been made against flights operated by multiple Indian airlines this week, Indian media reported Sunday, sparking fear among passengers and global delays. India's IndiGo airline confirmed threats were made against six of its flights on Sunday.

A plane with 147 people on board made an emergency landing in Germany over a bomb threat sent via X, police have said. The Indian carrier Vistara was already targeted in September by a bomb threat in a plane toilet.