Mystery surrounds killer

US counterterrorism investigators are trying to figure out why a 24-year-old Kuwait-born man who seemingly had a typical suburban American upbringing attacked two US military sites in a shooting rampage that left four Marines dead.

Mohammad Youssef Abdulazeez of Hixson, Tennessee, did not appear to have been on the radar of federal authorities before the bloodshed on Thursday, officials said, and they were still searching for a motive. Abdulazeez was killed by police.

A federal law enforcement official said authorities were continuing a search of Abdulazeez’s computer but had not found an extensive online presence and had not uncovered any evidence he was directly influenced by the Islamic State. They were also looking at a trip he made to Jordan last year to see whether he was in contact with extremists.

Residents in the quiet neighbourhood where Abdulazeez was believed to have lived in a two-storey home said they didn’t know him or his family well.

Abdulazeez got an engineering degree from the University of Tennessee at Chattanooga in 2012.

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