Filipinos stood in long lines to choose a new president Monday, with the son of an ousted dictator and a champion of human rights the top contenders in a tenuous moment in a deeply divided Asian democracy.

Ferdinand Marcos Jr., the son and namesake of the strongman ousted in a 1986 army-backed "People Power" uprising, held a seemingly insurmountable lead in pre-election surveys. But his closest challenger, Vice President Leni Robredo, has tapped into shock and outrage over the prospect of a Marcos recapturing the seat of power and harnessed a network of campaign volunteers to underpin her candidacy.

Eight others are in the presidential race, including former boxing star Manny Pacquiao, Manila Mayor Isko Moreno and former national police chief Sen. Panfilo Lacson.

Long lines of voters turned up early across most of the country, with the start of voting delayed by a few hours in a few areas due to malfunctioning vote machines, power outages, bad weather and other problems.

Thousands of police and military personnel were deployed to secure election precincts, especially in rural regions with a history of violent political rivalries and where communist and Muslim rebels are active. In Maguindanao province, a security hotspot in the south, three village guards were killed by gunmen outside an elections center in Buluan town, briefly disrupting voting. Nine would-be voters and their companions were wounded separately Sunday night when unidentified men fired five rifle grenades in the Datu Unsay town hall, police said.

The election winner will take office on June 30 for a single, six-year term as leader of a Southeast Asian nation hit hard by two years of COVID-19 outbreaks and lockdowns.

Still more challenging problems include a pandemic-battered economy, deeper poverty and unemployment and decades-long Muslim and communist insurgencies. The next president is also likely to hear demands to prosecute outgoing President Rodrigo Duterte for thousands of killings during his anti-drug crackdown - deaths already under investigation by the International Criminal Court.

Duterte's daughter, southern Davao city Mayor Sara Duterte, has topped surveys as Marcos Jr.'s vice-presidential running mate in an alliance of the scions of two authoritarian leaders who concern human rights groups. The tie-up has combined the voting power of their separate northern and southern political strongholds, boosting their chances but compounding worries of human rights activists.

"History may repeat itself if they win," said Myles Sanchez, a 42-year-old human rights worker. "There may be a repeat of martial law and the drug killings that happened under their parents."

Sanchez said the violence and abuses that marked the martial-law era under Marcos and Duterte's drug war more than three decades later victimized loved ones from two generations of her family. Her grandmother was sexually abused and her grandfather tortured by counterinsurgency troops under Marcos in the early 1980s in their impoverished farming village in Southern Leyte province.

Under Duterte's crackdown, Sanchez's brother, a sister and a sister-in-law were wrongfully linked to illegal drugs and separately killed, she told The Associated Press in an interview. She described the killings of her siblings as "a nightmare that has caused unspeakable pain."

She begged Filipinos not to vote for politicians who either openly defended the widespread killings or conveniently looked away.

Marcos Jr. and Sara Duterte have avoided such volatile issues in the campaign and steadfastly stuck instead to a battle cry of national unity, even though their fathers' presidencies opened some of the Philippines' most turbulent divisions.

"I have learned in our campaign not to retaliate," Sara Duterte told followers Saturday night on the final day of campaigning, where she and Marcos Jr. thanked a huge crowd in a night of rap music, dance shows and fireworks near Manila Bay.

At her own rally, Robredo thanked her supporters who jammed her star-studded sorties and waged a house-to-house battle to endorse her brand of clean and hands-on politics. She asked them to fight for patriotic ideals beyond the elections.

"We've learned that those who have awoken will never close their eyes again," Robredo told a crowd that filled the main avenue in the capital's Makati financial district. "It's our right to have a future with dignity and it's our responsibility to fight for it."

Aside from the presidency, more than 18,000 government posts are being contested, including half of the 24-member Senate, more than 300 seats in the House of Representatives, as well as provincial and local offices across the archipelago of more than 109 million Filipinos.

More than 67 million people have registered, including about 1.6 million Filipinos overseas, to cast their ballot. When voting centers close after the 13-hour day, thousands of counting machines will immediately transmit the results to be tallied. In the 2016 contest, Duterte emerged as the clear winner within a few hours and his key challengers quickly conceded. The vice presidential race that year was won narrowly by Robredo over Marcos Jr., and the outcome was slower to become known.

From The Associated Press