Maj. Filemon Tan, a regional military spokesman, said the clashes began early this week as troops advanced toward an Abu Sayyaf camp in Basilan Island's Al-Barka township. He said the fighting intensified yesterday and sporadic skirmishes were continuing today.
At least seven militants and 13 soldiers also were wounded, with most of the government casualties hit by Abu Sayyaf snipers, he added.
Tan said troops were advancing slowly because of the snipers and have yet to capture the camp.
He said the number of dead militants was based on accounts from engaged troops. The bodies were not recovered because they were dragged away by their comrades, he added.
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The Philippines and the United States have listed the Abu Sayyaf as a terrorist organisation for kidnappings, beheadings, extortion and bomb attacks. The al-Qaeda-linked militants have been weakened but have survived more than a decade of US-backed offensives.
The Abu Sayyaf is suspected of kidnapping two Canadians, a Norwegian and a Filipino woman from a marina in the south in September. Militants who identified themselves in an online video as belonging to the Abu Sayyaf demanded more than USD 60 million for the release of the three foreigners.