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.

The leader of Hezbollah vowed Thursday to keep up daily strikes on Israel despite this week’s deadly sabotage of its members’ communication devices, and said Israelis displaced from homes near the Lebanon border because of the fighting would not be able to return until the war in Gaza ends.

The absence of a full-blown war in Lebanon has been touted as a core U.S. achievement, but now Washington’s grip on the crisis appears more tenuous than ever.