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  • Josh Campbell
    Correspondent

    Josh Campbell is a CNN Correspondent covering law enforcement and national security.

    Full Bio

  • epa07773988 Philadelphia police block the intersection of 15th Street and W Pacific Street, in Philadelphia, Pennsylvania, USA, 14 August 2019. A suspect shot at least six Philadelphia police officers, with gunfire continuing for more than one hour. One suspect is in custody and a second suspect is under SWAT surveillance in a house near the intersection of 15th Street and W Erie Ave. EPA/STRINGER

    US counterterrorism officials warn police to be on alert for ambush attacks