The al-Mukhtar Army, Iraq's Shi'ite militia, has taken responsibility for a rocket attack near Baghdad that killed members of an Iranian opposition group, Iran's Fars news agency reports.

The attack occurred this morning (Friday), when about 15 rockets hit a camp belonging to the People's Mujahideen Organization of Iran. Twenty-three members were killed.

"We warned the members of this terrorist organization to leave Iraq as soon as possible ... If they don't do so, there will more similar attacks," said the al-Mukhtar Army commander.