MANILA - Anti-establishment firebrand Rodrigo Duterte secured a huge win in the Philippine presidential elections, according to a poll monitor, after an incendiary campaign dominated by his profanity-laced vows to kill criminals.
Mr Duterte, the longtime mayor of the southern city of Davao, hypnotised millions with his vows of brutal but quick solutions to the nation's twin plagues of crime and poverty, which many believed had worsened despite strong economic growth in recent years.
And after a record turnout of voters in Monday's elections, Mr Duterte scored a commanding victory, according to counts by various organisations.
With almost 90 per cent of the vote counted as of 7.30am Tuesday, he had some 15 million vote and an insurmountable lead of nearly 6 million votes over his nearest rival, administration candidate Mar Roxas, according to the data.
"It's with humility, extreme humility, that I accept this, the mandate of the people," Mr Duterte told AFP early Tuesday morning as the results came in.
"What I can promise you is that I will do my very best not just in my waking hours but even in my sleep."
Senator Grace Poe, the adopted daughter of movie stars, had collected 8.4 million votes by Tuesday morning but had already conceded just after midnight.
"As a staunch supporter of electoral reform, I have a firm belief in the voice and sentiment of our people. I honour the result of our elections," Ms Poe told reporters in Manila.
"I congratulate Mayor Rodrigo Duterte and pledge my support in working to heal our land and to unite our people toward the continued development of our country."
In the Philippines, a winner is decided simply by whomever gets the most votes.
Mr Duterte, a pugnacious 71-year-old, surged from outsider to the top of surveys with cuss-filled vows to kill tens of thousands of criminals, threats to establish one-man rule if lawmakers disobeyed him and promises to embrace communist rebels.
He also boasted repeatedly about his Viagra-fuelled affairs, while promising voters his mistresses would not cost a lot because he kept them in cheap boarding houses and took them to short-stay hotels for sex.
He caused further disgust in international diplomatic circles with a joke that he wanted to rape a "beautiful" Australian missionary who was killed in a 1989 Philippine prison riot, and by calling the pope a "son of a whore".
Departing President Benigno Aquino, whose mother led the democracy movement that ousted Ferdinand Marcos three decades ago, had warned repeatedly the nation was at risk of succumbing to another dictatorship.
"I need your help to stop the return of terror in our land. I cannot do it alone," Aquino said in an appeal to voters in a final rally on Saturday in Manila for Roxas, his preferred successor and fellow Liberal Party stalwart.
In his final rally on Saturday, Mr Duterte repeated to tens of thousands of cheering fans his plans to end crime within six months of starting his presidency.
"Forget the laws on human rights," said Mr Duterte, who has been accused of running vigilante death squads in Davao.
"If I make it to the presidential palace, I will do just what I did as mayor. You drug pushers, hold-up men and do-nothings, you better go out. Because as the mayor, I'd kill you."
Mr Aquino, who is limited by the constitution to a single term of six years, had overseen average annual economic growth of 6 per cent and won international plaudits for trying to tackle corruption.
However, his critics said he had done little to change an economic model that favours an extraordinarily small number of families that control nearly all key industries, and has led to one of Asia's biggest rich-poor divides.
This criticism hurt Roxas, a member of the wealthy classes widely seen by many as lacking empathy for the poor.
Another key message of Mr Duterte's campaign was his pledge to take on the elite, even though his vice presidential running mate was from one of the nation's richest and most powerful families.
Ms Poe had seen her popularity slide after critics pointed to her taking US citizenship then later giving it up.
Vice-President Jejomar Binay, the early favourite, was in a distant fourth place, according to the poll monitor, after crumbling under the weight of a barrage of corruption allegations.
In an intriguing sub-plot, former dictator Marcos's son and namesake, Ferdinand Marcos Jr., had a slight lead in the race to be elected vice president, according to the poll monitor, which would cement a remarkable political comeback for his family.