the messaging caught the attention of people like mitch sylber. >> there are going to be extra precautions that we're going to advise institutions take as kids are getting out of school on friday, people going synagogue friday night and sunday morning. in regular touch with nypd, requesting extra patrols in jewish areas. we asked the center on extremism to take us inside the threat scheme. >> not only are we seeing those who are apologists for hamas, those who glorify the messages, but we are seeing people on the far right that have traditionally engaged in violence against the jewish community full-throatedly supporting those activities. anti-semitism is always the thing that brings extremist groups groups across the ideological spectrum together. >> reporter: the adl and others say the events in israel and gaza are driving a tsunami of threats. >> in the last 36 hours, we have seen a 1000% increase in non-specific threats against jews and israelis by groups we track in the united states. >> reporter: and new york has seen the results of propaganda turned into blood shed. the series of bo