other suspect went to bunker hill community college. the younger brother, still at large, thought to be in watertown. the two came from chechnya, stopped in kazakhstan before coming to the united states. >> the older posted on the facebook. >> i don't have a single american friend. i don't understand them. i don't drink, don't smoke. waiting for more information on what exactly motivated them. we're picking up clues as to what was going on with them. most importantly for people watching right now. watertown, massachusetts, if you are in watertown or the surrounding area, do not leave your home. stay at home. unless there is an identified -- cleared identified police officer who comes to your door, do not open your door. stay there. there is a massive manhunt for what the law enforcement community calls a terrorist who wants to kill people in your