Al-Qaida's No. 2 Ayman al-Zawahri has vowed to avenge the U.S. killing of Abu Musab al-Zarqawi, leader of the terror network in Iraq.

"Yes (George W. Bush) Bush, there isn't a single person who will be killed that we won't get vengeance for, God willing," al- Zawahri said in a videotape aired by the al-Jazeera television on Friday.

Al-Zawahri also hailed al-Zarqawi as a martyr.

"We express our condolences to the Muslim nation on one of its greatest soldiers," al-Zawahri said.

Al-Zarqawi was killed in a U.S. air raid near the Iraqi capital of Baghdad on June 7.

Source: Xinhua