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Islamic State has claimed responsibility for attacks on civilians in several countries.
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The so-called Islamic State militant group said it carried out that attack.
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Islamic State claimed responsibility for the attack via its Amaq news service.
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Islamic State released a statement on its Amaq news agency claiming responsibility.
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Islamic State claimed responsibility in a statement on its Amaq news agency.
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Turnbull said it was critical to improve efforts to fight Islamic State.
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One reason is a specific decision by Islamic State to target France.
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The U.S. effort against Islamic State thus far has been relatively limited.
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But Islamic State terrorists did not respect any regional border, he said.
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Islamic militants often accuse Western aid groups of covert religious missionary work.
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The Islamic State militant group claimed responsibility on Tuesday for the attack.
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Islamic State militants have taken over large parts of Iraq and Syria.
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It was the third attack by Islamic State in Tunisia this year.
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The al Qaeda-affiliated Sunni militant group Islamic State of Iraq claimed responsibility.
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Islamic State said it was behind both the Paris and Brussels attacks.
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The Syria- and Iraq-based Islamic State claimed responsibility, but offered no proof.
