On Thursday morning, Hezbollah said it launched 200 rockets into Israel — one of its largest attacks yet — following the Israeli assassination of one of the group’s senior commanders, further ramping up fears over a potential full-blown war between the two heavily armed adversaries.

The Iran-backed Lebanese militant group, which is designated as a terrorist organization by the U.S. and U.K., said it fired at 10 Israeli military sites using a “squadron of drones.” Israel’s military said that “numerous projectiles and suspicious aerial targets” breached its territory,…