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In a phone interview with the BBC's North America editor, the president discussed next week's visit and his relationship with the UK PM.
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The BBC's Lyse Doucet reports from Iran, where the buzz of busy shopping streets masks deep uncertainty over the country's future.
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Sherpas cannot prepare the route to the world's highest peak because a huge block of ice is in the way.
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Opposition parties accused security forces but the official report does not say who was responsible.
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Ahmed Shihab-Eldin reportedly faced charges, including spreading false information, after he re-posted images related to the Iran war.