demonstrators slowly march their way towards here at times square. right now we're standing in front of toys r us building where this group has decided to walk in, to stage another die-in. you can see some of these demonstrators behind me. it's been a very fluid night here in new york city. these demonstrators are determined, they say, to have police reform in new york city and show them that the spotlight will continue to stay on this story for the days and weeks, they say, to come. >> nick valente in new york's times square. thank you for that. also this top story, president obama made a quick trip to walter reed medical center, complaining to a persistent sore throat. tests linked that to acid reflux. ct scan results were normal. dr. sanjay gupta says he thinks that scan was performed out of an abundance of caution. meantime, somebody's got to do it with mike rowe continues right now.