(FILES) In this file photo taken on October 21, 2017 members of the 3rd Special Forces Group (Airborne) 2nd battalion Fse comfort each other as they attend the burial service for U.S. Army Sgt. La David Johnson at the Memorial Gardens East cemetery in Hollywood, Florida. Sgt. Johnson and three other American soldiers were killed in an ambush in Niger on Oct. 4.   The United States on Friday offered a $5 million reward for information about the leader of an Islamic State branch which claimed responsibility for an ambush in Niger two years ago that left four US servicemen dead. / AFP / GETTY IMAGES NORTH AMERICA / JOE RAEDLE
US special forces soldiers attend the funeral of one of those killed in the 2017 ambush. AFP

US offers reward for ISIS leader linked to Niger ambush


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