Medea Benjamin, author and peace protester with US group Code Pink and Drones Watch, was removed after heckling President Obama during his foreign policy speech.
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The PM raised objections to the Hinkley Point nuclear power plant deal during the coalition government, an ex cabinet member claims.
The Cursed Child opens in London on Saturday and will immediately be followed by the midnight release of the play's script book.
A dry and fine weekend for most, with scattered showers and heavier downpours in Scotland.