A powerful <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Hafte_Tir_bombing" id="mwATo" rel="mw:WikiLink" title="Hafte Tir bombing">bomb explodes</a> in <a href="https://en.wikipedia.org/wiki/Tehran" id="mwATs" rel="mw:WikiLink" title="Tehran">Tehran</a>, killing 73 officials of the <a href="https://en.wikipedia.org/wiki/Islamic_Republican_Party" id="mwATw" rel="mw:WikiLink" title="Islamic Republican Party">Islamic Republican Party</a>.