A Shiite Muslim militia in Iraq claimed responsibility on Friday for a deadly rocket attack on an exiled Iranian opposition group housed near Baghdad, according to Iran's Fars news agency.

At least 15 rockets crashed in and around the camp of the People's Mujahideen Organization of Iran (PMOI) next to Baghdad International Airport on Thursday, killing 23 members, a Paris-based spokesman said.

"We warned the members of this terrorist organization to leave Iraq as soon as possible. ... If they don't do so, there will be more similar attacks," al-Mukhtar Army commander Wathiq al-Battat was quoted as saying by Fars.