A 27-year-old man armed with two handguns approached a police officer in Wisconsin, but the incident ended peacefully, largely because an NYPD officer had alerted Wisconsin officers that the man had threatened violence against them online that day, reports the New York Daily News .
NYPD Officer Gregory Santora tipped off Madison, WI, police of an impending attack on law enforcement there after he happened across a video of Raynarldo Glenn live-streaming on the app Periscope Saturday morning