The statement by U.N. human rights spokesman Rupert Colville in Geneva is the first independent confirmation of how deadly the pre-dawn riot last Friday was.
Mr. Colville said most of the dead at the camp in Iraq’s eastern Diyala province appeared to have been shot.
He said six bodies have still not been found.
The raid targeted the People’s Mujahedeen Organization of Iran, which seeks to overthrow Iran’s clerical leaders.