The so-called Islamic State militant group said it carried out that attack.
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Earlier efforts produced fierce clashes at sea with anti-whaling group Sea Shepherd.
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Rights group Amnesty International believes China executes thousands of people every year.
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Mr Williams said the group would also look at possible court action.
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Banking group Abbey National today said it had received a takeover approach.
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A change of government could bring radical changes in the health system.
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A Labour spokesman said: Ed has made clear he wants radical reform.
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Speaking last week, former sports minister Richard Caborn called for radical change.
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Conservation and radical technologies, including new nuclear, could be key, he said.
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Jeremy Corbyn said Britain was ready for a new and radical approach.
In organic chemistry, a specific grouping of elements that is characteristic of a class of compounds, and determines some properties and reactions of that class.