White House National Security Communications Adviser John Kirby said the U.S. is doing “everything we can" to prevent an "all-out war" between Israel and Hezbollah.

Israel launched one of its most intense bombardments against Hezbollah targets in Lebanon this year Thursday, hours after the militant group’s leader condemned deadly twin attacks that he said crossed “all the red lines.

Israel and Lebanon have exchanged heavy fire, with Israeli warplanes carrying out the most intense bombardment in almost a year of war across Lebanon's south, while Hezbollah claimed rocket attacks on military targets in Israel's north.