Israeli military said it had killed a “large number” of militants when it hit about 1,600 suspected Hezbollah targets around the country. Hezbollah said Tuesday it had launched volleys of missiles at Israeli military bases, hours after 180 of its projectiles and an unmanned aerial vehicle crossed into Israeli airspace, sending people in the city of Haifa running for shelter.

In Lebanon, Monday’s raids killed 492 people, including 35 children and 58 women, and wounded 1,645, according to the health ministry. The Israeli military said more than 50 projectiles were fired into northern Israel in less than 10 minutes on Tuesday morning, most of which were intercepted. The bombardment of Lebanon was by far the largest, not just in the past year but since the Israel-Hezbollah war in the summer of 2006.

World leaders have expressed alarm over the rapid escalation on the Lebanon front, with UN chief Antonio Guterres’s spokesman saying he was “gravely alarmed” and the EU’s top diplomat Josep Borrell warning “we are almost in a full-fledged war.” France, Egypt, Iraq, and the Pentagon are sending a small number of additional US military personnel to the Middle East after thousands were deployed earlier alongside warships, fighter jets, and air defense systems.

The G7 foreign ministers warned of “unimaginable consequences” if a regional war broke out. Israeli army chief Herzi Halevi said Monday’s strikes hit combat infrastructure Hezbollah had been building for two decades, while Defence Minister Yoav Gallant called Monday “a significant peak” in the operation.