Deadly Israeli attacks that blew up Hezbollah radios and pagers crossed all red lines, the leader of the heavily armed Iran-backed Lebanese movement said on Thursday, as the United States called for restraint and urgent de-escalation.

Israeli jets bombarded southern Lebanon and staged a show of force over Beirut just as Hezbollah’s leader vowed to avenge the covert operation that turned his fighters into walking booby traps. Hassan Nasrallah admitted that his movement had been dealt “a huge and severe blow” after two days of remote-controlled explosions targeting electronic