Dzhokhar's elder brother Tamerlan - a fellow suspect - was killed during a clash with police three days after the 15 April bombings, which killed three people and wounded 264.

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Andrew Mitchell, the Tory chief whip under a cloud after his clash with police in Downing Street, will stay away - even though the conference is just up the road from his constituency.

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In December, Mr Costa sought the president's backing in a clash with his chief of police over promotions.

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Venezuela police clash with students protesting constitutional reforms.

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The 70-year-old Fir Park boss was spoken to by police after a clash with a visiting director, Kim Brink.

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Police continued to clash with demonstrators in other districts of Istanbul as well as in the capital, Ankara, late Saturday night.

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At least five police officers have died in an armed clash with gunmen in eastern Sabah state, officials in Malaysia say.

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Police in Kosovo have fired tear gas in a clash with protesters angered by recent talks aimed at improving ties between Serbia and its former province.

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Any blanket restriction, they say, would clash with First Amendment press freedoms and make it difficult for the public to monitor what the police do on its behalf.

ECONOMIST: Law and the media