DUBAI, Sept 21: A militant group headed by Al Qaeda ally Abu Musab al-Zarqawi has killed second American captive in Iraq after the lapse of a 24-hour deadline on Tuesday, Arabic channel Al Jazeera said.

It said a statement announcing the killing by the Tawhid and Jihad group had been posted on the Internet. It gave no further details.

Meanwhile, in Washington, a US intelligence official said on Tuesday after the CIA determined that the Al Qaeda ally was the speaker on the videotape of the beheading of the American hostage Eugene Armstrong. "There is high confidence that the voice is indeed of Abu Musab al Zarqawi," a CIA official said. -Reuters