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".

Saudi Arabia's King Salman has a lung infection and was set to undergo medical tests on Sunday night, the Royal Court said in the latest update on the ageing monarch's health.

King Salman "will undergo some medical tests this evening, ...based on the recommendations of the royal clinics, due to a lung infection," said the statement carried by the official Saudi Press Agency.

The 88-year-old king has been on the throne since 2015, though his son, Mohammed bin Salman, 39, was named crown prince in 2017 and acts as day-to-day ruler.

Israel's president on Monday kicked off global commemorations on the first anniversary of Hamas's deadly October 7 attack, with memorials held to honour the victims and the hostages still in captivity in Gaza.

Protests were also held against the wars the unprecedented attack sparked in Gaza and Lebanon.

In Israel, President Isaac Herzog began the day with a moment of silence at 6:29 am -- the time the attack began -- at Kibbutz Reim, the site of the Nova music festival where at least 370 people were killed by heavily armed Hamas fighters on October 7.

Polls closed Sunday night in Tunisia after voting in a presidential election expected to see incumbent Kais Saied secure another five years in office while his main critics -- including one contender -- are behind bars.

Three years after Saied staged a sweeping power grab, rights group fear re-election will only further entrench his rule in the country which became the only democracy to emerge from the Arab Spring uprisings.

With candles, prayers and music, commemorations for the October 7 attack began in Israel's Tel Aviv on Sunday at a ceremony to mark the first anniversary of the Hamas onslaught at the Nova music festival.

Picture of those killed appeared on a screen at the entrance to the ceremony, as hundreds gathered to light candles at a makeshift shrine, leave handwritten notes or simply embrace each other.

"Coming to this event one year after this terrible massacre that happened on October 7, it's very touching, it's very breathtaking," said one of the event's organisers Solly Laniado.