Britain and Egypt have asked their airlines to avoid Iranian and Lebanese airspace amid growing fears of a possible broader conflict in the region after the killing of senior members of militant groups Hamas and Hezbollah.

Britain’s advisory to its airlines to avoid Lebanon’s airspace came hours after Egypt instructed all of its airlines to avoid Iran’s airspace early this morning. Many airlines globally are revising their schedules to avoid Iranian and Lebanese airspace while also calling off flights to Israel and Lebanon.

U.S.-based United Airlines said yesterday, its flights to Tel Aviv, which were paused on July 31 due to security concerns, remained suspended.