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US drone strikes detailed by adviser

30 April 2012 Last updated at 22:30 BST

President Obama's counter-terrorism adviser has given the most detailed explanation so far of America's use of drones to kill members of al-Qaeda during a speech at a Washington think tank.

John Brennan justified the use of the drones as legal, proportional and necessary.

"Individuals who are part of al-Qaeda or its associated forces are legitimate military targets," Mr Brennan said during the speech to the Woodrow Wilson International Center.