February 15, 2018 12:08 am Warning Signs of Suspected Mass Shooters The motive of a 19-year-old man who is suspected of killing at least 17 people at a Florida high school remains unclear but a psychotherapist from Massachusetts says there may have been warning signs. US & World Videos 2:13 Spring cleaning your closet space 2:21 Opening statements in Karen Read retrial begin Tuesday 0:22 4 people taken to hospital after reported shooting 5:10 Catholics wait to learn who will succeed Pope Francis 2:38 Boston police find woman dead in Allston apartment, arrest man after chase
