Chairman <a href="https://en.wikipedia.org/wiki/Mao_Zedong" id="mwARY" rel="mw:WikiLink" title="Mao Zedong">Mao Zedong</a>'s second in command and successor Marshal <a href="https://en.wikipedia.org/wiki/Lin_Biao" id="mwARc" rel="mw:WikiLink" title="Lin Biao">Lin Biao</a> flees China after the failure of an alleged coup. His plane crashes in <a href="https://en.wikipedia.org/wiki/Mongolia" id="mwARg" rel="mw:WikiLink" title="Mongolia">Mongolia</a>, killing all aboard.