Middle Eastern nations are bracing for the potential widening of the Israel-Hamas war amid threats by Iran to avenge the killing of Hamas’ political leader in Tehran last week. Iran’s Supreme Leader Ayatollah Ali Khamenei vowed to retaliate against Israel for the assassination of the head of Hamas’ political bureau Ismail Haniyeh in Tehran on Wednesday. The country’s Islamic Revolutionary Guard Corps has warned that “blood vengeance” for the killing is “certain.

” Both Tehran and Hamas blame Israel for the killing but Israel hasn’t confirmed or denied involvement. Hundreds of Lebanese prepared to flee the country as nations called on their citizens to leave Lebanon. The US embassy in Beirut on Saturday encouraged citizens who wish to depart “to book any ticket” as several airlines suspended or canceled flights to the country.

In Israel, the government evaluated its preparedness and options should Iran and its regional proxies attack, while citizens stocked up on supplies in anticipation of an Iranian assault. This week’s events could determine the course of the war in Gaza and significantly shift the focus away from the besieged enclave if retaliation by Iran escalates into a wider regional conflict involving the United States and other nations. Such escalation could also jeopardize efforts to reach a ceasefire in Gaza and release hostages, despite recent progress in negotiations.

Iran and Israel exchanged direct fire for the first time in April after a.