'Deadly mistakes can occur,' Obama says of U.S. strike that killed hostages

' height='259' alt='Pakistan Abducted American' width='460' src='http://news.guugll.com/wp-content/uploads/2015/04/deadly-mistakes-can-occur-obama-says-of-u-s-strike-that-killed-hostages.jpg' />

American aid worker Warren Weinstein and an Italian held hostage by al-Qaeda were inadvertently killed in U.S. counterterrorism operations earlier this year, the White House says.

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