There was no immediate comment from the airline on the matter. Nearly 100 flights have received bomb threats this week but they turned out to be hoaxes.

Afghanistan authorities on Sunday did not permit a Frankfurt-bound Vistara plane to use its airspace as there was a bomb threat, forcing the aircraft to return to Delhi, according to sources. The flight UK25 from the national capital to Frankfurt in Germany was operated with a Boeing 787 aircraft and had more than 240 people onboard,

Vistara flight UK17 from Delhi to London was diverted to Frankfurt due to a bomb threat received via social media. The aircraft landed safely, and after security checks, it will continue its journey,