TEHRAN, Iran (AFP)—A United States (US) fighter jet disabled two Iranian-flagged tankers to enforce a port blockade on Friday, prompting retaliatory attacks and rattling a shaky truce as Tehran weighed Washington’s latest proposal to end the Middle East war.

Iranian officials accused the United States of violating the ceasefire with the tanker strikes and hampering diplomatic efforts to end the conflict.

A parallel ceasefire in Lebanon was also under strain. Iran-backed Hezbollah launched missiles and drones at military bases in Israel in retaliation for a recent attack on Beirut and ongoing strikes in the south, where Lebanese authorities reported 11 people killed on Friday.