Flight operations at Hamburg Airport, which were suspended due to a threat of attack on an Iranian plane, have started again. “Flight operations have resumed. There may still be flight delays,” it said on the airport’s homepage on Monday.

Flight operations were completely stopped at around 12.40 p.m. There were no take-offs or landings for around an hour and a half; incoming planes were diverted to Hanover, among other places.

A spokesman for the Federal Police told the DPA news agency that the Federal Police received an email in the morning threatening to attack the Tehran-Hamburg plane. This threat is taken very seriously. He initially did not comment on the background.

The plane landed in Hamburg at around 12:20 p.m. and is now in a special area. The 198 passengers and 16 crew members were able to leave the aircraft normally and were subjected to a security check in a separate area. The plane and luggage were also reportedly searched.

Editor’s note: This article has been updated several times.