Michael Berg, whose son Nick was beheaded in Iraq in 2004, said on Thursday he felt no sense of relief at the killing of the al Qaeda leader in Iraq and blamed President Bush for his son's death. The United States said its aircraft killed Abu Musab al-Zarqawi, the insurgent leader who masterminded the death of hundreds in suicide bombings and was blamed for the videotaped beheading of Nick Berg, a U.S. contractor, and other captives. I don't think that Zarqawi is himself responsible for the killings of hundreds of thousands of people in Iraq," Berg said in a combative television interview with the U.S. Fox News network. Berg said Bush was to blame for the torture of Iraqi prisoners by U.S. soldiers at Abu Ghraib prison near Baghdad. "Yeah, like George Bush didn't OK the torture and death and rape of people in the Abu Ghraib prison for which my son was killed in retaliation?" Zarqawi's organization took responsibility for the execution of Nick Berg in May 2004. The video was published with a caption saying: "Abu Musab al-Zarqawi slaughtering an American." When an Islamist Web site showed the video of a man severing Berg's head, the CIA said Zarqawi was probably the one wielding the knife. The father said he was not convinced. "I have been lied to by my own government," he told Reuters on Thursday.