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Islamic State claimed responsibility for a shooting in which a 64-year-old American man killed at least 50 people and wounded more than 400 in Las Vegas, but U.S. officials said there was no evidence so far linking the gunman to any international militant group. In its claim, Islamic State said the gunman had converted to Islam a few months ago, according to the group's news agency Amaq. U.S. officials said American security agencies were examining the claim of responsibility.