Israel's military says a Hezbollah drone killed four soldiers at one of its northern bases, as it expanded its bombardments of Lebanon and troops battled militants across the border.
The attack on a military training camp in Binyamina, near Haifa, is the deadliest such assault on an Israeli base since September 23, when Israel increased its attacks on Hezbollah in Lebanon.
Emergency services reported more than 60 wounded.
Whole families killed in school air strike: Gaza officials
Authorities in Gaza, meanwhile, said the death toll from an Israeli strike on Sunday, local time, on a school being used as a shelter for displaced people had risen to 15, including whole families.
And as fighting raged between Israel and Hezbollah forces in Lebanon's south, United Nations peacekeepers said they were again in the firing line.
They said Israeli troops "forcibly" entered a UN position with two tanks, after Israeli Prime Minister Benjamin Netanyahu called on the force to withdraw from the area.
Israel's military said a tank had backed into the UN post while under fire.
'Attack drones' injure dozens at military base
Iran-backed Hezbollah said late on Sunday that it launched "a squadron of attack drones" at the Binyamina camp, about 30 kilometres south of the major city of Haifa.
The strike was in response to Israeli attacks, including air strikes on Thursday, that Lebanon's health ministry said killed at least 22 people in central Beirut.
In a later statement, Hezbollah warned Israel that "what it witnessed today in southern Haifa is nothing compared to what awaits it if it decides to continue its aggression against our noble and dear people".
An Israeli volunteer rescue service, United Hatzalah, said its teams in Binyamina assisted "over 60 wounded people" with injuries from mild to critical.
Hezbollah, which is a proscribed terrorist organisation in Australia, has been firing rockets and drones into Israel for more than a year in support of Hamas in Gaza, following that group's terrorist attack in southern Israel on October 7, 2023.
Since late September, however, Hezbollah's strikes have reached further into Israel.
Israel's sophisticated air defences have intercepted most of the projectiles, with few casualties caused by strikes or falling debris.
Clashes spread beyond traditional strongholds
Israel's recent strikes have increasingly focused on areas beyond Hezbollah's traditional strongholds in southern Beirut, and Lebanon's south and east.
Israel said its air force hit "Hezbollah launchers, anti-tank missile posts, weapons storage facilities" and other targets, while on the ground its soldiers "eliminated dozens" of fighters.
Lebanon's official National News Agency (NNA) said Israeli forces had "escalated their attacks" on southern Lebanon with "successive air strikes" pounding several border villages.
It later reported that an Israeli strike on Mayfadoun, near Nabatiyeh, in southern Lebanon, had killed five people and wounded one other.
Hezbollah said its forces clashed several times with Israeli troops who tried to "infiltrate" villages along the border.
Before the drone strike, it had said it launched a salvo of rockets at a "base in southern Haifa".
The group later aired an audio recording of its slain leader Hassan Nasrallah calling on fighters to "defend this holy and blessed land and this honourable people".
Nasrallah was killed in an Israeli air strike in south Beirut on September 27, and several other senior commanders of the movement have also been killed.
Israel's military said about 115 projectiles fired by Hezbollah had crossed into Israeli territory by Sunday afternoon.
A Hezbollah fighter was captured emerging from a tunnel in south Lebanon on Sunday, Israel's military said, the first such announcement since the start of the ground offensive.
Israeli tanks enter UN peacekeeping base
UN peacekeepers accused Israeli troops of breaking through a gate and entering one of their positions before dawn on Sunday in south Lebanon, the latest of several incidents the UNIFIL mission has reported since Thursday.
Five UN peacekeepers have so far been injured, provoking international condemnation.
"Two IDF Merkava tanks destroyed the position's main gate and forcibly entered the position" in the Ramia area, before leaving 45 minutes later, UNIFIL said.
The Israeli military later said a tank "backed several metres into a UNIFIL post" while "under fire" and attempting to evacuate injured soldiers.
Earlier on Sunday, Mr Netanyahu had called on the UN to move peacekeepers in southern Lebanon out of harm's way, after the mission rejected requests to abandon its positions.
The peacekeepers' presence had "the effect of providing Hezbollah terrorists with human shields", Mr Netanyahu said.
UN chief Antonio Guterres on Sunday said "attacks" against peacekeepers "may constitute a war crime".
UNIFIL, with about 9,500 troops, is in southern Lebanon under the longstanding UN Security Council Resolution 1701, which stipulated that only the Lebanese army and UN peacekeepers should be deployed in south Lebanon.
Three Lebanese soldiers were wounded on Sunday, the country's army said, when Israeli forces fired on military vehicles in the Marjayoun area.
French President Emmanuel Macron, in a phone call with Iran's President Masoud Pezeshkian, appealed to Iran to support "a general de-escalation" in Lebanon and Gaza, his office said.
US sending more air-defences
The United States will send a Terminal High Altitude Area Defense (THAAD) battery and troops to Israel.
The Pentagon made the announcement on Sunday, shortly after Iran warned Washington to keep American military forces out of Israel.
Pentagon spokesman Major General Pat Ryder said in a statement that Defense Secretary Lloyd Austin authorised the deployment of the THAAD battery at the direction of US President Joe Biden.
Major General Ryder said the air defence system would help bolster Israel's air defences following Iran's missile attacks in April and October.
The THAAD is a defensive system that shoots down incoming ballistic missiles.
Gaza school hit by 'large volley of Israeli artillery'
Gaza's civil defence agency said Israeli shelling had killed at least 15 people and wounded dozens more on Sunday at a school-turned shelter for displaced Palestinians in central Gaza's Nuseirat camp.
"The school was bombarded with a large volley of Israeli artillery, resulting in an initial death toll of 15 martyrs, including children, women and entire families, and 50 wounded," said Mahmud Bassal, spokesman for the agency.
Israel's military said it was "looking into the reports".
Meanwhile, explosions hit early on Monday outside Al-Aqsa Martyrs Hospital in Deir al-Balah, killing three people and injuring about 50 others, the hospital said.
Tents caught fire, and residents of the Central Gaza community carried the injured into the hospital.
The head of the World Health Organization (WHO), Tedros Adhanom Ghebreyesus, said late on Sunday that a WHO-Red Cross operation had managed to resupply two hospitals in northern Gaza.
"WHO and partners finally managed to reach Kamal Adwan and Al-Sahaba hospitals yesterday after 9 attempts this past week," he posted on X.
Growing death tolls
Hamas sparked the war in Gaza with the deadliest-ever attack on Israel on October 7, 2023, which resulted in the deaths of 1,206 people, mostly civilians, according to an AFP tally of official Israeli figures.
The number includes hostages killed in captivity.
The health ministry in Hamas-run Gaza says more than 42,000 people, the majority civilians, have been killed since Israel's military campaign began there. The UN considers these figures to be reliable.
Israeli strikes in Lebanon have killed more than 1,300 people since September 23, according to an AFP tally of official figures, including for Saturday.
That toll exceeds the entire Lebanese toll of 1,200 — mostly civilians — in the last Hezbollah-Israel war in 2006, when 160 people, mostly soldiers, died in Israel.
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