BEIRUT (AP) — Hezbollah fired a new barrage into northern Israel on Thursday, continuing its drumbeat of exchanges with the Israeli military as fears of a greater war rise after hundreds of electronic devices exploded in Lebanon, killing at least 32 people and wounding more than 3,000 others.

The device explosions appeared to be the culmination of a monthslong operation by Israel to target as many Hezbollah members as possible all at once. Over two days, pagers and walkie-talkies used by Hezbollah detonated, wounding and even crippling some fighters, but also maiming civilians connected to the group’s social branches and killing at least two children.

It was unclear how the attack fit into warnings by Israeli leaders in recent weeks that they could launch a stepped-up military operation against Hezbollah, Lebanon’s strongest armed force. The Israeli government has called it a war aim to end the Iranian-backed group’s crossborder fire in order to allow tens of thousands of Israelis to return to homes near the border.

Speaking to Israeli troops on Wednesday, Israeli Defense Minister Yoav Gallant said, “We are at the start of a new phase in the war — it requires courage, determination and perseverance.” He made no mention of the exploding devices but praised the work of Israel’s army and security agencies, saying “the results are very impressive.”

Gallant said that after months of fighting Hamas in Gaza, “the center of gravity is shifting to the north by diverting resources and forces.”

Hezbollah said early Thursday it had targeted military positions in northern Israel, without specifying what weapons it used. Israeli hospitals reported that they treated at least eight patients injured in the attacks. The military said early Thursday that it had struck several militant sites in southern Lebanon overnight.

The volley of strikes was a signal by Hezbollah that it would continue its near daily fire, which it says is a show of support for Hamas amid Israel’s 11-month-old campaign in Gaza in retaliation for the Palestinian militants’ Oct. 7 attack on Israel.

Israel has responded to Hezbollah’s fire with strikes in southern Lebanon, and has struck senior figures from the group in the capital Beirut. The exchanges have killed hundreds in Lebanon and dozens in Israel and forced the evacuation of tens of thousands of residents on each side of the border.

Israel and Hezbollah have repeatedly pulled back from an all-out war under heavy pressure from the United States, France and other countries.

But in their recent warnings, Israeli leaders have said they are determined to change the status quo dramatically.

Israeli began moving more troops to its border with Lebanon on Wednesday as a precautionary measure, Israeli officials said. Israel’s army chief, Lt. Gen. Herzi Halevi, said plans have been drawn up for additional action against Hezbollah, though media reported the government has not yet decided whether to launch a major offensive in Lebanon.

Meanwhile, Lebanon was still reeling from the unprecedented mass bombings of Tuesday and Wednesday.

The explosions have rattled anxious Lebanese fearing a full-scale war. The Lebanese Army said it has been locating and detonating suspicious pagers and communication devices, while the country’s civil aviation authorities banned pagers and walkie-talkies on all airplanes departing from Beirut’s international airport until further notice.

The attack was likely to severely disrupt Hezbollah’s internal communication as it scrambles to determine safe means to talk to each other. Hezbollah announced the death of five combatants today, but didn’t specify if they were killed in the explosions or on the front lines.

Hezbollah leader Hassan Nasrallah was scheduled to speak later Thursday as the group vowed to retaliate against Israel.

The blasts went off wherever the holders of the pagers or walkie-talkies happened to be in multiple parts of Beirut and eastern and southern Lebanon — in homes and cars, grocery stores and cafes and on the street, even at a funeral for some killed in the bombings, often with family and other bystanders nearby.

Many suffered gaping wounds on their legs, abdomens and faces or were maimed in the hand. Tuesday’s pager blasts killed 12 people, including two children, and wounded some 2,800 others. The following day’s explosion killed 20 and wounded more than 450.

Health Minister Firas Abiad praised Lebanon’s hospitals, saying they had managed to deal with the flood of wounded within hours. “It was an indiscriminate attack. It was a war crime,” he said.

Mary Ellen O’Connell, a professor of law and international peace studies at the University of Notre Dame in Indiana, said booby-traps are banned under international law. “Weaponizing an object used by civilians is strictly prohibited,” she said.