The situation deteriorated hours after world leaders called for calm in the region, with Syria joining Lebanon and Gaza under Israeli bombardment.

Syrian air defenses were activated and managed to intercept at least one incoming "projectile" in Tartous as suspected Israeli warplanes flew off the Syrian coast, according to the Syrian Observatory for Human Rights.

Israel's military says it has struck 300 Hezbollah targets inside Lebanon since Monday morning. Follow Newsweek's live blog for updates.

Israel has begun a new wave of attacks across Lebanon. NBC News' Richard Engel has our latest reporting on the escalating conflict between Israel and Hezbollah. Former Department of Defense senior advisor Jason Beardsley and former State Department senior advisor Nayyera Haq join Ana Cabrera to discuss.

Israel has said it is preparing for the "next phases" of operations targeting Hezbollah in Lebanon as concern grows over a wider conflict. Authorities said nearly 500 people were killed in Israeli strikes.

Gaza Nations across the Middle East have condemned Israel's attacks on Lebanon, with the UAE releasing a statement “rejecting violence, escalation and reckless actions”. Israel's conflict with the Lebanese group Hezbollah turned into an open-ended war on Monday after the Israeli military launched its most

Israel has warned people to stay away from sites used by Hezbollah and has carried out new airstrikes in Lebanon. Israel says Hezbollah is preparing to attack Israel and that it has launched new strikes on the Iran- backed group Lebanese media says areas in the south and the Bekaa Valley region have been struck Lebanese authorities say almost 500 people