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.

At least 12 people were killed, including an 11-year-old boy and a 9-year-old girl, and more than 2,700 people injured in the coordinated explosions of pagers that belonged to Hezbollah members. A day later,

Hundreds of handheld pagers exploded near simultaneously in parts of Lebanon and Syria, killing at least nine people — including members of the militant group Hezbollah and a young girl.