Iraqi Shi'ite militia helping to fight ISIS in Iraq attacks exiled Iranian opposition

The commander of Iraq's Shi'ite Muslim al-Mukhtar Army militia claimed responsibility on Friday for a deadly rocket attack on a camp holding members of an exiled Iranian opposition group near Baghdad, according to Iran's Fars news agency.

About 15 rockets crashed near the camp of the People's Mujahideen Organisation of Iran (PMOI) next to Baghdad International Airport on Thursday and killed 23 of its members, a Paris-based spokesman for the group said.

"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," al-Mukhtar Army commander Wathiq al Battat was quoted as saying by Fars.

The Al-Mukhtar Army has said it is supported and funded by Iran's government. The Fars news agency is close to Iran's powerful Islamic Revolutionary Guards Corps.

The United States urged the Iraqi government to increase security at so-called Camp Liberty and find those responsible for the attack and hold them accountable. The United Nations refugee agency UNHCR also condemned Thursday's attack.