LAUSANNE, Switzerland - With a deadline hours away, Iran and six world powers ramped up the pace on Tuesday in negotiations over a preliminary deal on Tehran's nuclear program, while officials cautioned that any agreement would likely be fragile and incomplete. | Video
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LONDON - Brent crude oil dropped towards $55 a barrel on Tuesday as Iran and six world powers entered a final day of talks over a nuclear deal that could see the energy-rich country increase oil exports to world markets.
WASHINGTON - An armed prisoner was on the run in a stolen car on Tuesday after escaping from a northern Virginia hospital where a shot was fired during a struggle with a guard, police said.
ABUJA - Nigeria's opposition All Progressives Congress (APC) declared an election victory on Tuesday for former military ruler Muhammadu Buhari and said Africa's most populous nation was witnessing history with its first democratic transfer of power. | Video
TOKYO - Japanese Prime Minister Shinzo Abe's push to allow Tokyo to come to the aid of an ally under attack will pave the way for closer cooperation between U.S. and Japanese forces across Asia, a top U.S. commander said on Tuesday.
TOKYO/TAIPEI - Japan remains cautious about signing up to the China-led Asian Infrastructure Investment Bank (AIIB), indicating that Tokyo will miss the March 31 deadline for application, but both Taiwan and Norway said they would seek to join the institution.
BOSTON - Accused Boston Marathon bomber Dzhokhar Tsarnaev's older brother, Tamerlan, researched radio transmitters, fireworks and gun stores in the weeks leading up to the 2013 attack that killed three people, a computer expert testified on Tuesday.
ISTANBUL - A far-left Turkish group took an Istanbul prosecutor hostage on Tuesday and threatened to kill him, prompting special forces to enter the courthouse and police to evacuate the building.