MANILA, Philippines (AP) — Philippine forces killed an Abu Sayyaf militant, who had been implicated in past beheadings, including of 10 Filipino marines and two kidnapped Vietnamese, in a clash in the south, police officials said Friday.

Philippine police, backed by military intelligence agents, killed Nawapi Abdulsaid in a brief gunbattle Wednesday night in the remote coastal town of Hadji Mohammad Ajul on Basilan island after weeks of surveillance, security officials said.

Abu Sayyaf is a small but violent armed Muslim group, which has been blacklisted by the United States and the Philippines as a terrorist organization for ransom kidnappings, beheadings, bombings and other bloody attacks.

It has been considerably weakened by battle setbacks, surrenders and infighting, but remains a security threat particularly in the southern Philippines, home to minority Muslims in the predominantly Roman Catholic nation.