Three American airlines and a British carrier have cancelled their flights to Israel in response to escalating security tensions as Tel Aviv braces for possible retaliation from the Lebanese Hezbollah group following the assassination of one of its key military leaders in Beirut, Anadolu Agency reports.

Israeli Army Radio reported that American carriers United Airlines and Delta Air Lines decided on the move following the assassination of senior Hezbollah commander Fuad Shukr on Tuesday.

Israel’s Yedioth Ahronoth daily also confirmed that British Airways had announced the suspension of its flights to Israel.

“United Airlines, which operates 14 weekly flights to Tel Aviv, informed customers of flight cancellations for the coming days,” the newspaper said. “Delta cancelled Wednesday’s and Thursday’s flights from New York,” it added.

The newspaper noted that “British Airways also announced cancellations, though it is unclear if they are for the next 24 or 48 hours.”