BAGHDAD (AFP) - An Al-Qaeda-linked militant group has claimed an attack on an Iraqi television station headquarters in which five journalists were killed.

At the direction of the Islamic State of Iraq and the Levant's "war ministry," militants attacked "the headquarters of the Salaheddin satellite

(channel) which... distorts the facts and fights the Sunni people," the group said on online jihadist forums.

It said two militants took part in the attack on Monday, although police said four suicide bombers assaulted the channel's headquarters in Tikrit, north of Baghdad.

The attack killed five of the channel's journalists -- the chief news editor, a copy editor, a producer, a presenter and the archives manager -- and wounded five more of its employees.

Iraq has come in for repeated criticism over the lack of media freedom and the number of unsolved killings of journalists.

The country is experiencing the worst violence against journalists in years, with 12 killed in attacks since October 5.

Violence has reached a level not seen since 2008, when Iraq was just emerging from a brutal period of sectarian killings.

More than 6,650 people have been killed in Iraq since the beginning of the year, according to AFP figures based on security and medical sources.