Five Philippine marines were killed and 20 others were wounded in a clash early Monday with about 100 to 200 al-Qaida-linked Abu Sayyaf rebels, officials said.
The Abu Sayyaf militants were believed led by their leader Khaddafy Janjalani and fugitive Indonesian extremists, officials said.
Hundreds of troops have been hunting Janjalani and at least two Indonesian members of the regional group Jemaah Islamiyah in US-backed offensives since last month.
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