Al-Qaida's No. 2 Ayman al-Zawahri has vowed to avenge the US 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 US air raid near the Iraqi capital of Baghdad on June 7.

Iraqi Prime Minister Nuri al-Maliki ordered on Friday an all-out curfew in Baghdad from Friday afternoon until Saturday morning, Iraqi state television reported.

The curfew takes effect as of 2:00 p.m. (1000 GMT) Friday until 6:00 a.m. Saturday (0200 GMT), the television said.

The government had already imposed a traffic ban in the capital from 11:00 a.m. (0700 GMT) to 3:00 p.m. (1100 GMT) on Friday.

(Xinhua News Agency June 24, 2006)