First mailing of <a href="https://en.wikipedia.org/wiki/Anthrax" id="mwAXY" rel="mw:WikiLink" title="Anthrax">anthrax</a> letters from <a href="https://en.wikipedia.org/wiki/Trenton,_New_Jersey" id="mwAXc" rel="mw:WikiLink" title="Trenton, New Jersey">Trenton, New Jersey</a> in the <a href="https://en.wikipedia.org/wiki/2001_anthrax_attacks" id="mwAXg" rel="mw:WikiLink" title="2001 anthrax attacks">2001 anthrax attacks</a>.