Police spokesman Reuben Theodore Sindac said today that the suspect, Haik Asgali, was arrested in Sulu province in a joint police and military operation.
Sindac says Asgali's team kidnapped Dutch Ewold Horn and Swiss Lorenzo Vinciguerra while they were on a bird-watching trip in southern Tawi Tawi province in February 2012.
The militants from the Abu Sayyaf group are holding for ransom more than a dozen captives. US-backed military offensives have crippled the group in recent years but it remains a key security threat.