A top leader of a Muslim extremist kidnapping group and three junior guerrillas have been arrested in the Philippines.
Nadzmie Sabtulah, also known as Commander Global, is the highest ranking member of the Abu Sayyaf arrested yet.
National police Chief Leandro Mendoza said a tip-off led officers to a hideout in General Santos City.
They are part of a group holding about 20 hostages on the southern island of Basilan.
Nadzmie Sabtulah is believed to have participated in a mass kidnapping of foreigners at a beach resort in Malaysia last year.
Thousands of troops have been hunting the Abu Sayyaf and their hostages for more than a month on Basilan.