ANTAKYA, Turkey — Even as Syria’s security forces have tortured and massacred civilians and anti-government activists, armed members of the Syrian opposition have carried out “serious human rights abuses” against Syrian soldiers and some civilians, the New York-based Human Rights Watch said Tuesday.

The watchdog organization made the allegations of kidnapping, torture, detention and other misconduct in a public letter to the main Syrian opposition group, the Syrian National Council, and other opposition groups. The letter urges anti-government leaders to condemn and forbid the abuses.

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