A second wave of deadly blasts rocked Lebanon on Wednesday, as hand-held radios that had been covertly turned into explosive devices and carried by Hezbollah members blew up across the country, killing at least 20 people, wounding more than 450 others and shocking the nation.

It was the second coordinated attack against Hezbollah, the Lebanese armed group backed by Iran, and the explosions came as the country was burying its dead from the day before, when pagers exploded, killing at least 12 people and injuring 2,700 more, officials said.

Hezbollah blamed Israel for the pager attack, and American and other officials said Israel had hidden tiny explosives in a shipment of Taiwanese-made pagers imported into Lebanon.

The Israeli military neither claimed nor denied responsibility for the pager explosions, and it did not immediately respond to a request for comment on the latest attack. But Israeli officials issued statements on Wednesday signaling their intent to take more aggressive action to push Hezbollah forces away from Israel’s northern border.

Hezbollah has been exchanging cross-border strikes with Israel for 11 months, even as Israel battles Hezbollah’s ally, Hamas, in the Gaza Strip. Hezbollah began firing missiles and drones at Israel in the wake of the Hamas-led attacks on Oct. 7, prompting Israel to strike across Lebanon. For months, both sides have avoided all-out war.

But Israel’s defense minister, Yoav Gallant, said that Israel was “at the outset of a new period in this war, and we must adapt.”