British Prime Minister Tony Blair says it is a "complete obscenity" for terrorists to try to justify their actions.
Mr. Blair was referring to a videotape aired Thursday of al-Qaida's second in command, Ayman al-Zawahiri, who said Britain and the United States would face more deaths unless they pull out of Iraq.
The prime minister charged that those responsible for the video support the killing of innocent people in Iraq, Afghanistan and anywhere that people want to live under the rules of democracy.
The al-Zawahiri video aired on the Arab satellite channel al-Jazeera.
Some information for this story provided by AP and AFP.
