Al-Jazeera TV has aired an audiotape said to be the first released by Abu Hamza al-Muhajer, the new leader of al-Qaida in Iraq. In the tape, al-Muhajer said he was confdent that victory will be acheived and called on all mujahedeen to unite on the battlefield, the station reported. It played a brief excerpt from the tape, in which the speaker said, "Our enemy has unified its ranks against us. Isn't it time to get together, worshippers of God? Al-Muhajer, a previously unknown militant, became the leader of Iraq's most feared insurgent group after Abu Musab al-Zarqawi was killed in a US airstrike in June. US officials say they believe al-Muhajer is an Egyptian.