The Philippine military says suspected Abu Sayyaf militants have abducted a South Korean skipper and a Filipino crewman from a South Korean cargo ship.

Regional military spokesman Maj. Filemon Tan says about 10 gunmen boarded the MV Dongbang Giant using ropes from a speedboat and abducted the skipper Chul Hong and Filipino crewman Glenn Alindajao on Thursday off Bongao town in Tawi Tawi province. The ship was on its way to South Korea from Australia.

Tan said Friday other crewmen were not seized and one managed to call his family, which reported the assault to authorities.

Similar sea attacks by Muslim extremists in the southern Philippines have sparked a regional security alarm.