Their names are Musa'ab Mahmoud Al-Azawi - the network's manager in Mosul, -- Ehab Maad, Ahmed Salim, Qaidar Sleiman.

Their bodies were found in the deserted house, each shot in the chest or head or both.

On Sunday, Abdul-Sattar said five suspects were in custody. Two of them were found in possession of a pistol; it was not clear if it had been recently fired, and forensics tests will take three days, he said.

Prime Minister Nouri Al Maliki, the United States Embassy and the Islamic Party of Iraq issued statements condemning the killings.