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They've tracked down 70 leads so far. the investigation hasn't yet uncovered any evidence that the shootings were inspired or directed by isis about you they are being investigated as an act of terrorism. nbc news has learned 24-year-old mohammad youssuf abdulazeez spent much of last year in the middle east. it's a trip that friends and others who knew him say may have radicalized him. nbc's sarah joins us from chattanooga. what's the latest we know in terms of a motive? >> reporter: good morning, steve. that's what investigators have been trying to answer. they've been working around the cloc...

Steve. very sad news to report this morning. another blow to this community already dealing with so much shock and so much grief as investigators continue to work around the clock to determine the motive for the shooting why this gunman targeted armed forces after others who knew him describe him as just a normal guy. what happened? what changed it? did his overseas travel have anything to do with it? was this possibly inspired by isis? a lot of questions remaining in the investigation. but the sad news that a fifth victim petty officer randall smith, has passed away this morning. back to you....