LAUSANNE, Switzerland - Six world powers and Iran negotiated past a March 31 deadline into the wee hours of Wednesday, struggling to conclude an outline accord on Tehran's nuclear program in the face of a U.S. threat to abandon the talks. | Video
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BERLIN - The German pilot who crashed a plane in the French Alps last week, killing 150 people, told officials at a Lufthansa training school in 2009 that he had gone through a period of severe depression, the airline said on Tuesday. | Video
ABUJA - Three decades after seizing power in a military coup, Muhammadu Buhari became the first Nigerian to oust a president through the ballot box, putting him in charge of Africa's biggest economy and one of its most turbulent democracies. | Video
TIKRIT, Iraq - Iraqi troops aided by Shi'ite paramilitaries have driven Islamic State out of central Tikrit, Prime Minister Haidar al-Abadi said on Tuesday, but the fight to retake all of Saddam Hussein's hometown continued. | Video
- U.S. cable T.V. operator Cablevision Systems Corp is planning to make an offer for the New York Daily News as early as this week, valuing the troubled tabloid at just $1, according to a person familiar with the matter. | Video
NEW YORK - Oil fell for a third straight session on Tuesday, with Brent crude tumbling 12 percent for the month, as world powers entered into intense negotiations with Iran for a nuclear deal that could bring more of its oil to an oversupplied market.
BOSTON - Lawyers for accused Boston Marathon bomber Dzhokhar Tsarnaev wrapped up their case on Tuesday after calling only four witnesses over two days.
WASHINGTON - U.S. and allied military forces have carried out eight air strikes against Islamic State militants in Iraq and Syria since Monday, according to a U.S. military statement on Tuesday.