Webster Police Chief Gerald L. Pickering from New York State commenting on a gunman who killed two firefighters as they tackled a fire, said that it appeared that the gunman had "set a trap" for them.
He added that the gunman had died from a gunshot wound.
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The British territory of St Helena is in the South Atlantic, and the government has warned swimmers to enter the sea at their own risk.
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Tony Kim, who taught accounting at Pyongyang University of Science and Technology, was detained as he tried to leave the country.