The body of Noi-sung Hong was found in a sack on a roadside in Indanan town in Sulu province, where the militants have been holding several foreign and Filipino kidnapping victims in their jungle bases in the mountains, according to army Brig Gen Alan Arrojado and the police.
An initial investigation showed that the militants brought down the remains of the 74-year-old from their jungle encampment after he died from an unspecified illness, Arrojado said. There was no sign of any wound caused by gunfire or bladed weapon in his body, according to a police report.
A government anti-terrorism official said by phone that the militants initially demanded a ransom of 500 million pesos (USD 10.6 million), but later agreed to drastically reduce the amount as Hong fell ill and was often transported on a horse because he was too weak to walk.
The ransom demand was made a few weeks after the abduction through telephone calls to his family and through Facebook, where the militants posted a picture of the frail Korean sitting on the ground without a shirt and surrounded by heavily-armed masked men standing in front of a black flag with Arabic words, said the official, who spoke on condition of anonymity because he was not authorized to talk to reporters.
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It was not immediately clear if any amount was handed to the militants.
The kidnapping prompted South Korea to issue a travel advisory, warning its citizens to stay away from southern Mindanao region due to threats of abductions and other crimes.
The al-Qaida-linked Abu Sayyaf, which is blacklisted by the United States and the Philippines as a terrorist organization for deadly bombings, kidnappings for ransom, beheadings and extortion, has been weakened by years of US-backed military offensives.
They are still holding several hostages, including a Dutch bird watcher who was kidnapped more than three years ago in nearby Tawi Tawi province, two Malaysians and a Japanese.