Israel's widely expected ground invasion of Lebanon appeared to be getting underway early on Tuesday as its military said troops had begun "limited" raids against Hezbollah targets in the border area, Reuters reported.

The military said in a statement that it had begun "limited, localised, and targeted ground raids based on precise intelligence" against Hezbollah in southern Lebanon villages close to the border that posed "an immediate threat to Israeli communities in northern Israel".

It said the air force and artillery were supporting the ground forces with "precise strikes."

Local residents in the Lebanese border town of Aita al-Shaab reported heavy shelling and the sound of helicopters and drones overhead. Flares were repeatedly launched over the Lebanese border town of Rmeish, lighting up the night sky.

On Monday, Israeli Defence Minister Yoav Gallant had told local council heads in northern Israel that the next phase of the war along Lebanon's southern border would begin soon, and would support the aim of bringing home Israelis who have fled Hezbollah rockets during nearly a year of border warfare.

The ground invasion represents an escalating conflict in the Middle East between Israel and Iran-backed militants, sparked by an assault on Israel by Palestinian militant group Hamas on Oct. 7, 2023, that now threatens to suck in the U.S. and Iran, read the report.

An Israeli strike in Lebanon early on Tuesday targeted Mounir Maqdah, commander of the Lebanese branch of the Palestinian Fatah movement's military wing, the Al-Aqsa Martyrs Brigade, according to two Palestinian security officials.

His fate was unknown.

The strike hit a building in the crowded Ain al-Hilweh Palestinian refugee camp near the southern city of Sidon, the sources said. It marked the first strike on the camp, Lebanon's largest Palestinian camp, since cross-border hostilities between Hezbollah and Israel broke out nearly a year ago.

In Syria, three civilians were killed and nine others injured in an Israeli airstrike on the capital Damascus, Syrian state media said on Tuesday citing a military source. Israel's military said it does not comment on foreign media reports.

Israel has been carrying out strikes against Iran-linked targets in Syria for years but has ramped up raids since the Hamas attack on Israel's southern territory on Oct. 7, 2023.

Hamas killed 1,200 people and took about 250 hostage in its assault on Israel, according to Israeli tallies. Israel in response launched a massive assault on Hamas in Gaza, reducing most of the Palestinian territory to rubble, displacing most of its 2.3 million people and killing more than 41,300 Palestinians, according to the Gaza health ministry.

Israel's ground invasion into Lebanon follows its deadly detonation of booby-trapped Hezbollah pagers, two weeks of airstrikes, and its killing on Friday of Hezbollah head Hassan Nasrallah, which dealt the group one of the heaviest blows in decades, Reuters reported.

The intensive air strikes have eliminated several Hezbollah commanders but also killed about 1,000 civilians and forced one million to flee their homes, according to the Lebanese government.

Overnight, strikes hit Beirut's southern suburbs, a security source said. A Reuters reporter witnessed a flash of light and a series of loud blasts about an hour after the Israeli military warned residents to evacuate areas near buildings it said contained Hezbollah infrastructure south of the Lebanese capital.

In the past 24 hours, at least 95 people had been killed and 172 wounded in Israeli strikes on Lebanon's southern regions, the eastern Bekaa Valley, and Beirut, Lebanon's health ministry said early on Tuesday.

Hezbollah's deputy leader Naim Qassem, in a first public speech on Monday since Nasrallah's death, said that "the resistance forces are ready for a ground engagement."

He said Hezbollah had continued to fire rockets as deep as 150 km (93 miles) into Israeli territory.

"We know that the battle may be long. We will win as we won in the liberation of 2006," he said, referring to the last big conflict between the two foes.

Late on Monday, Lebanese troops pulled back about five kilometres (3 miles) from positions along Lebanon's southern border with Israel, a Lebanese security source told Reuters. A Lebanese army spokesperson did not confirm or deny the movement.

Lebanon's army has historically stayed on the sidelines of major conflicts with Israel, and in the last year of hostilities has not fired on the Israeli military, read the report.

The White House and the U.S. State Department did not immediately respond to a request for comment on Israel's ground operations in Lebanon.

But on Monday, U.S. President Joe Biden had called for a ceasefire.

"I'm more worried than you might know and I'm comfortable with them stopping," Biden told reporters when asked if he was comfortable with Israeli plans for a cross-border incursion. "We should have a ceasefire now."

Israel last week rejected a proposal by the U.S. and France calling for a 21-day ceasefire on the Lebanon border to give time for a diplomatic settlement that would allow displaced civilians on both sides to return home.

Palestinian militant group Hamas said an Israeli strike killed its leader in Lebanon on Monday, while another Palestinian militant group said three of its leaders were killed in a strike on Beirut, the first attack within the city limits.

Hamas said its leader in Lebanon, Fateh Sherif Abu el-Amin was killed, along with his wife, son, and daughter, in a strike that targeted their house in a Palestinian refugee camp in the southern city of Tyre in the early hours of Monday.

As Israel escalates hostilities against Iran's allies in the region, the Popular Front for the Liberation of Palestine (PFLP) said three of its leaders were killed in a strike that targeted Beirut's Kola district.

The strike hit the upper floor of an apartment building, Reuters witnesses said.

There was no immediate comment from Israel's military.

Israel's increasing frequency of attacks against the Hezbollah militia in Lebanon and the Houthi militia in Yemen have prompted fears that Middle East fighting could spin out of control and draw in Iran and the United States, Israel's main ally.

The PFLP is another militant group taking part in the fight against Israel.

Israel on Sunday launched airstrikes against the Houthi militia in Yemen and dozens of Hezbollah targets throughout Lebanon after earlier killing the Hezbollah leader.Lebanon's Health Ministry has said more than 1,000 Lebanese have been killed and 6,000 wounded in the past two weeks, without saying how many were civilians.

The government said a million people - a fifth of the population - have fled their homes.

The intensifying Israeli bombardment over two weeks has killed a string of top Hezbollah officials, including its leader Sayyed Hassan Nasrallah.

Israel has vowed to keep up the assault and says it wants to make its northern areas secure again for residents who have been forced to flee Hezbollah rocket attacks.

Israeli drones hovered over Beirut for much of Sunday, with the loud blasts of new airstrikes echoing around the Lebanese capital.

Nepal has shut schools for three days after landslides and floods triggered by two days of heavy rain across the Himalayan nation killed 151 people, with 56 missing, officials said on Sunday.

The floods brought traffic and normal activity to a standstill in the Kathmandu valley, where 37 deaths were recorded in a region home to 4 million people and the capital.

Authorities said students and their parents faced difficulties as university and school buildings damaged by the rains needed repair.

"We have urged the concerned authorities to close schools in the affected areas for three days," Lakshmi Bhattarai, a spokesperson for the education ministry, told Reuters.

Some parts of the capital reported rain of up to 322.2 mm (12.7 inches), pushing the level of its main Bagmati river up 2.2 m (7 ft) past the danger mark, experts said.

But there were some signs of respite on Sunday morning, with the rains easing in many places, said Govinda Jha, a weather forecaster in the capital.

"There may be some isolated showers, but heavy rains are unlikely," he said.

Television images showed police rescuers in knee-high rubber boots using picks and shovels to clear away mud and retrieve 16 bodies of passengers from two buses swept away by a massive landslide at a site on the key route into Kathmandu.

Weather officials in the capital blamed the rainstorms on a low-pressure system in the Bay of Bengal extending over parts of neighbouring India close to Nepal.

Haphazard development amplifies climate change risks in Nepal, say climate scientists at the International Centre for Integrated Mountain Development (ICIMOD).

"I’ve never before seen flooding on this scale in Kathmandu," said Arun Bhakta Shrestha, an environmental risk official at the centre.

In a statement, it urged the government and city planners to "urgently" step up investment in, and plans for, infrastructure, such as underground stormwater and sewage systems, both of the "grey", or engineered kind, and "green", or nature-based type.

The impact of the rains was aggravated by poor drainage due to unplanned settlement and urbanisation efforts, construction on floodplains, lack of areas for water retention, and encroachment on the Bagmati river, it added.

The level in the Koshi river in Nepal's southeast has started to fall, however, said Ram Chandra Tiwari, the region's top bureaucrat.

The river, which brings deadly floods to India's eastern state of Bihar nearly every year, had been running above the danger mark at a level nearly three times normal, he said.