The strikes came hours after Hezbollah’s leader vowed that “retribution will come” to Israel for the explosions of Hezbollah members’ hand-held devices. At least 37 people were killed and more than 2,900 others injured in those explosions on Tuesday and yesterday. Here’s the latest.

In a period replete with violent attacks across the region—from Israel’s bombardment of the Gaza Strip to the targeted assassinations of militant leaders in Iran and Lebanon—this was perhaps the most sophisticated and daring one yet.