President Joe Biden and US election rivals Kamala Harris and Donald Trump marked the first anniversary on Monday of Hamas's October 7 attacks on Israel, as the Middle Eastern conflict threatens to weigh on November's presidential vote.

In a solemn Jewish ceremony of mourning at the White House, Biden lit a candle while a rabbi chanted a prayer for the victims, with the president calling for peace even as the region teeters on the edge of all-out war.

Waving Hamas flags and carrying portraits of slain Hezbollah leader Hassan Nasrallah, hundreds rallied in support of the Palestinian struggle in the occupied West Bank city of Ramallah Monday, the first anniversary of Hamas's attack on Israel.

About 400 Palestinian protesters of all ages and representing various political factions marched in the de-facto Palestinian capital, which is controlled by long-time Hamas rival the Palestinian Authority, an AFP correspondent reported.

President Kais Saied was poised Monday to win Tunisia's election by a huge margin, though low voter turnout reflected widespread discontent in the cradle of the Arab Spring pro-democracy uprisings.

Three years after Saied staged a sweeping power grab, rights groups fear his re-election will entrench his grip on power in the only democracy to emerge from the 2011 protests.

Exit polls showed Saied, 66, expected to rout his challengers with 89 percent of the vote.

Human Rights Watch on Monday said Israeli strikes near the main Lebanon-Syria border crossing were putting civilians at "grave risk" as they prevented them from fleeing and hampered humanitarian operations.

The Israeli military said Friday its jets struck Hezbollah positions near the Masnaa border crossing in Lebanon's eastern Bekaa Valley.

Syrian transport ministry official Sleiman Khalil told AFP on Monday the road was still "completely cut off to vehicle traffic", but people could still cross on foot.

One year after Hamas's deadly attack on Israel unleashed war in Gaza, the Palestinian territory is unrecognisable and its residents are exhausted by displacement and shortages, with no end in sight.

"It felt like the first day of the war all over again", said Khaled al-Hawajri, 46, as the Israeli forces bombarded his Gaza neighbourhood on Monday, even as Israel marked the anniversary of Hamas attack.

"Last night we were terrorised by the bombardments from quadcopters and tank shells," said Hawajri, who has been displaced 10 times with his family of seven in the past year.

Families lit candles and observed a moment of silence at a memorial service in southern Israel to mark the first anniversary of Hamas's October 7 attacks on Monday, as the sounds of helicopters and artillery fire echoed from nearby Gaza.

At the Nova rave site, President Isaac Herzog began the day with a moment of silence at 06:29 am -- the minute the attack began with thousands of rockets fired from Gaza to provide air cover to militants storming across the border a year ago.

Israel on Monday battled on multiple fronts, intensifying its fight with Lebanon's Hezbollah as Prime Minister Benjamin Netanyahu vowed to press the "sacred mission" against Israel's enemies, on the first anniversary of the deadliest attack in Israeli history.

Hamas said it will be a long fight, but Netanyahu said both wars would ensure the violence Israel endured last October 7 could never be repeated.

Israel's military said air defences intercepted a missile fired from Yemen, while in the West Bank, Palestinian officials reported a deadly Israeli raid.

Tunisia's incumbent President Kais Saied is set to win the country's presidential election with 89.2 percent support despite a low turnout, according to exit polls broadcast on national television Sunday after polls closed.

Saied, 66, is expected to win by a landslide, routing his challengers -- imprisoned rival Ayachi Zammel, who was set to collect 6.9 percent of the vote, and Zouhair Maghzaoui, with 3.9 percent, said independent polling group Sigma Conseil.

Tunisia's incumbent President Kais Saied is set to win the country's presidential election with 89.2 percent support despite a low turnout, according to exit polls broadcast on national television Sunday after polls closed.

Saied, 66, is expected to win by a landslide, routing his challengers -- imprisoned rival Ayachi Zammel, who was set to collect 6.9 percent of the vote, and Zouhair Maghzaoui, with 3.9 percent, said independent polling group Sigma Conseil.

Official Lebanese media reported four Israeli strikes on south Beirut Sunday, shortly after calls by Israel's army for residents to evacuate the Hezbollah stronghold which has been bombarded for several days.

"Enemy warplanes launched two strikes on the southern suburbs, the first targeted the Saint Therese area, and the second targeted the Burj al-Barajneh area," Lebanon's National News Agency said.

The NNA later reported two additional strikes, including one it described as "violent".