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Maguindanao massacre suspect Andal Ampatuan Jnr. (centre) is escorted by Philippine police

Detained Maguindanao massacre suspect Andal Ampatuan Jnr. (centre). Relatives of 57 people killed in the Philippines' worst political massacre marked two years since the killings Wednesday with pleas for authorities to speed up the justice process

Maguindanao massacre: Witnesses killed

Several witnesses in the Maguindanao massacre case have been killed over the past months, some of them even dismembered.