World War II: Four thousand <a href="https://en.wikipedia.org/wiki/Chongqing" id="mwxw" rel="mw:WikiLink" title="Chongqing">Chongqing</a> residents are <a href="https://en.wikipedia.org/wiki/Asphyxia" id="mwyA" rel="mw:WikiLink" title="Asphyxia">asphyxiated</a> in a bomb shelter during the <a href="https://en.wikipedia.org/wiki/Bombing_of_Chongqing" id="mwyQ" rel="mw:WikiLink" title="Bombing of Chongqing">Bombing of Chongqing</a>.