Philippine officials say the death toll from Typhoon Mangkhut has risen to 28, mostly due to landslides in northern mountain provinces.
Police Director General Oscar Albayalde told The Associated Press that 20 had died in the Cordillera region, four in Nueva Vizcaya province and another outside of the two regions, as the typhoon battered the rice-growing and mountain area on Saturday. Three more deaths have been reported in northeastern Cagayan province, where the typhoon made landfall.
On Sunday morning, Mangkhut is barreling toward densely populated southern China and Hong Kong, where authorities raised the highest storm warnings and moved nearly half a million people to shelter from seven cities.
The strongest storm so far this year in the world sliced across the northern tip of Luzon Island on Saturday, a breadbasket that is also a region of flood-prone rice plains and mountain provinces with a history of deadly landslides. More than 5 million people were in the path of the typhoon, equivalent to a Category 5 Atlantic hurricane when it hit the Philippines. It currently packed sustained winds of 155 kilometers (96 miles) per hour and gusts of up to 190 kph (118 mph).
China and the Philippines agreed to postpone a visit by Chinese Foreign Minister Wang Yi that was to start Sunday due to the typhoon's onslaught, which caused nearly 150 flights, a third of them international, to be canceled and halted sea travel.
The Hong Kong Observatory said although Mangkhut had weakened slightly, its extensive, intense rainbands were bringing heavy downfall and frequent squalls. Storm surge of about 3 ½ meters (9.8 feet) or above is expected at the city's waterfront Victoria Harbour, the observatory said, appealing on the public to avoid the shoreline.
Francis Tolentino, an adviser to Philippine President Rodrigo Duterte, said many died mostly in landslides and houses that got pummeled by the storm's fierce winds and rain. Among the fatalities were an infant and a 2-year-old child who died with their parents after the couple refused to immediately evacuate from their high-risk community in a mountain town in Nueva Vizcaya province, Tolentino said.
"They can't decide for themselves where to go," he said of the children, expressing frustration that the tragedy was not prevented.
Mayor Mauricio Domogan said at least three people died and six others were missing in his mountain city of Baguio after strong winds and rain destroyed several houses and set off landslides, which also blocked roads to the popular vacation destination. It was not immediately clear whether the deaths and missing cited by Domogan had been included in Tolentino's count.
Authorities were verifying the drownings of three people, including two children. About 70 men reportedly returned to their coastal village in Cagayan to check on their homes as the storm drew closer Friday, but Tolentino said he had received no reports of the men figuring in an accident.
About 87,000 people had evacuated from high-risk areas of the Philippines. Tolentino and other officials advised them not to return home until the lingering danger had passed.
In Cagayan's capital, Tuguegarao, where the typhoon made landfall, Associated Press journalists saw a severely damaged public market, its roof ripped apart and wooden stalls and tarpaulin canopies in disarray. Outside a popular shopping mall, debris was scattered everywhere and government workers cleared roads of fallen trees. Many stores and houses were damaged but most residents remained indoors as occasional gusts sent small pieces of tin sheets and other debris flying dangerously.
The Tuguegarao airport terminal also was damaged, its roof and glass windows shattered by strong winds.
The typhoon struck at the start of the rice and corn harvesting season in Cagayan, a major agricultural producer, prompting farmers to scramble to save what they could of their crops, Cagayan Gov. Manuel Mamba said.
In Hong Kong, Security Minister John Lee Ka-chiu urged residents to prepare for the worst.
Cathay Pacific said all of its flights would be canceled between 2:30 a.m. local time on Sunday and 4 a.m. Monday.
"Because Mangkhut will bring winds and rains of extraordinary speeds, scope and severity, our preparation and response efforts will be greater than in the past," Lee said. "Each department must have a sense of crisis, make a comprehensive assessment and plan, and prepare for the worst."
In nearby Fujian province in China, 51,000 people were evacuated from fishing boats and around 11,000 vessels returned to port on Saturday morning.
China's National Meteorological Center issued an alert saying Mangkhut would make landfall somewhere on the coast in Guangdong province on Sunday afternoon or evening.
Ferry services in the Qiongzhou Strait in southern China were halted on Saturday and helicopters and tugboats were dispatched to Guangdong to transfer offshore workers to safety and warn ships about the typhoon, China's official Xinhua News Agency reported.
Mangkhut, the Thai word for mangosteen fruit, is the 15th storm this year to batter the Philippines, which is hit by about 20 a year and is considered one of the world's most disaster-prone countries. In 2013, Typhoon Haiyan left more than 7,300 people dead or missing, flattened villages, swept ships inland and displaced more than 5 million in the central Philippines.
Associated Press writers Jim Gomez and Gillian Wong contributed to this report.