Rajini Vaidyanathan
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US confirms four American citizens killed by drones

23 May 2013 Last updated at 04:56 BST

The US justice secretary has acknowledged that four Americans have been killed abroad in drone strikes since 2009.

Eric Holder said only one individual had been specifically targeted - the radical cleric Anwar al Awlaki, who was killed in Yemen in 2011.

President Barack Obama is due to make a major speech on counter-terrorism on Thursday, laying out the thinking behind drone strikes, and the legal arguments.

Rajini Vaidyanathan reports.