Away. Families facing tough struggles, forgetting all their troubles on the open sea. Nightly news begins now. Announcer from nbc news World Headquarters in new york this is nbc nightly news with lester holt. Good evening. It was an act of terror but with no clear motive. Remarkably a day after a young kuwaiti american man shot up a pair of military sites in tennessee investigators have yet to uncover the telltale pieces you would normally expect to find answering the question why. It was confirmed today that Police Fatally shot Mohammad Abdulazeez but not before he had taken the lives of four u. S. Marines. Most of them we also learned today were war veterans. The question tonight is if he believed strongly enough in something to kill why didnt he leave behind an explanation . Our team has been working this story all day. We want to start with kate snow. Kate good evening. Reporter good evening, lester. Tonight the fbi saying they have tracked down 70 leads and though theres no eviden