"We are constantly monitoring the situation in the Middle East and are in close contact with the authorities. The safety of our guests and crew members is Lufthansa's top priority," a spokesperson for the company told Reuters.

Iran's supreme leader, Ayatollah Ali Khamenei, said on Wednesday that Israel "must be punished and it shall be" for attacking the Iranian embassy compound in Syria. In a major escalation of Israel's war with regional adversaries, suspected Israeli warplanes bombed Iran's consulate in the Syrian capital on April 1 in a strike that Iran said killed seven military advisers.

(Reporting by Birgit and Riham Alkousaa, editing by Kirsti Knolle)