posted on a reddit. >> they posted an act of violence on 125th street and lexington. >> it is a rant from a white supremacist saying today they're targeting harlem with loaded weapons. >> how recently did this come into your office? >> this just came in today. >> this is a fresh one? >> this is as fresh as you can get. visit some establishments and encourage them to call if they see anything that's out of place. >> at this early stage in the investigation, the unit has little to go on besides the online threat. so their goal today is a show of force. their presence on the streets could help deter a possible attack. >> today is more preventative, trying to prevent any violence. that's why we're out here now and be there for the public. >> after today, if nothing