Opposition groups say police shot him in the back, nearly six weeks after a 16-year-old died in another clash with police.
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.
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.
In December, Mr Costa sought the president's backing in a clash with his chief of police over promotions.
Venezuela police clash with students protesting constitutional reforms.
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Powerful drug mafias periodically clash with Afghan troops and police, as do local tribal leaders who have grown frustrated by the lack of reconstruction and development in the provinces, four years after President Hamid Karzai took office.
The 70-year-old Fir Park boss was spoken to by police after a clash with a visiting director, Kim Brink.
Police continued to clash with demonstrators in other districts of Istanbul as well as in the capital, Ankara, late Saturday night.
The press box at the stadium was empty except for a handful covering for foreign media after a clash between Bangladeshi journalists an police armed with batons.
At least five police officers have died in an armed clash with gunmen in eastern Sabah state, officials in Malaysia say.
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.
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.
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