U.S. rights group says Syria hiding detainees

BEIRUT (Reuters) - Syrian authorities moved hundreds of detainees to military sites off-limits to Arab League monitors, Human Rights Watch said, as observers began a mission to assess whether Syria has ended its violent crackdown on anti-government protests.

A report by the U.S.-based group urged the observers, who began their mission in the flashpoint city of Homs, to insist on full access to all sites used for detention.