An Al-Qaeda-linked fighters claimed an attack on an Iraqi television station headquarters that killed five journalists, while the UN envoy condemned the targeting of media in Iraq.
At the direction of the Islamic State of Iraq and the Levant's "war ministry," fighters attacked "the headquarters of the Salaheddin satellite (channel) which... distorts the facts and fights the Sunni people," the group said on online forums on Tuesday
It said two fighters 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 employees.
Worst violence since 2008
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.
"I am increasingly and gravely concerned about the targeting of journalists by terrorist elements during the past few weeks," United Nations envoy Nickolay Mladenov said in a statement on Tuesday.
"This latest blatant act of terrorism at the Tikrit television station should be properly investigated and measures taken to prevent such heinous acts in future," he said.
"I call upon the Iraqi government and (parliament) to ensure that adequate protection is provided to journalists and media outlets in Iraq," Mladenov said.
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.