text: Police surrounded a restaurant across the street from Princeton University&#39;s campus during a stand off with an armed man, on Tuesday, March 20, 2018 in Princeton, N.J. Police say there are &amp;quot;no known hostages&amp;quot; in the Panera Bread, but it&#39;s not clear what sparked the standoff that began early this morning. (Michael Mancuso/NJ Advance Media via AP