The crewmen were believed to be taken by two separate groups to a jungle camp in Sulu, a predominantly Muslim province about 950 kilometers south of the Philippine capital, Manila, Foreign Minister Retno Marsudi told a news conference in Jakarta.
Jolo island in Sulu province is a stronghold of militants from the Abu Sayyaf group, notorious for ransom kidnappings and beheadings of hostages.
"This third incident absolutely cannot be tolerated," Marsudi said. "The government will do everything possible to ensure the release of all those hostages. The safety of the seven Indonesians will be prioritized."
Filipino militants held 14 Indonesians among more than 20 hostages after raiding tugboats in separate incidents in late March and early April. The Indonesians were freed last month following reports that a ransom was paid, but the Indonesian government denied it gave money.
Foreign ministers and military chiefs from Indonesia, Malaysia and the Philippines agreed in a recent meeting to boost maritime security and take possible coordinated actions, including sea and air patrols, to stem a wave of kidnappings.
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