At least 60 people have been killed in Israeli attacks on Lebanon's eastern Bekaa Valley, the Lebanese health ministry said.
Two children were among those killed in strikes which targeted 16 areas in the Baalbek region, officials said.
The ministry said 58 people were wounded, adding rescue efforts were still under way in the valley, which is a Hezbollah stronghold.
The Israeli military has not yet commented.
Israel has carried out thousands of air strikes across Lebanon over the past five weeks, targeting what it has said are Hezbollah's operatives, infrastructure and weapons.
Baalbek governor Bachie Khodr called the attacks the "most violent" in the area since Israel escalated the conflict against Hezbollah last month.
Unverified video posted on social media showed damage to buildings and forests ablaze, as rescuers searched for the injured.
In the town of Boudai, videos on social media appeared to show residents pleading for heavy equipment to be sent to help rescue people believed to be trapped.
The regional head of Baalbek's Civil Defence crews told the BBC that the air strikes were like a "ring of fire".
'It was a very violent night," Bilal Raad said.
"It was like a ring of fire has suddenly surrounded the area."
He added the attacks had targeted "residential quarters where civilians live or near them", and said a lack of equipment had hampered search and rescue efforts.
The town of Al-Allaq was hardest hit with 16 people killed, all from the same family, he said.
Earlier on Monday, Israeli air strikes on the coastal city of Tyre left seven dead and 17 injured, Lebanon's health ministry said. Israel issued a warning for people to leave the centre of the city.
Hezbollah said it clashed with Israeli troops near Lebanon's southern border on Monday and fired rockets at a naval base inside Israel near Haifa.
Cross-border hostilities between Israel and Hezbollah broke out after the armed Lebanese group started firing rockets in and around northern Israel in support of Palestinians on 8 October 2023, the day after its ally Hamas’s deadly attack on southern Israel.
The Lebanese health ministry says more than 2,700 people have been killed and more than 12,400 wounded in Lebanon since then.
Israel invaded southern Lebanon in a dramatic escalation on 30 September to destroy, it said, Hezbollah weapons and infrastructure in “limited, localised, targeted raids”.
Lebanon's government says up to 1.3 million people have been internally displaced as a result of the conflict.