World War II: <a href="https://en.wikipedia.org/wiki/United_States_Army_Air_Forces" id="mw0Q" rel="mw:WikiLink" title="United States Army Air Forces">United States Army Air Forces</a> bomber aircraft accidentally cause more than 900 civilian deaths, including 209 children, and 1,300 wounded among the civilian population of the Belgian town of <a href="https://en.wikipedia.org/wiki/Mortsel" id="mw0g" rel="mw:WikiLink" title="Mortsel">Mortsel</a>. Their target was the Erla factory <span about="#mwt103" data-mw='{"parts":[{"template":{"target":{"wt":"convert","href":"./Template:Convert"},"params":{"1":{"wt":"1"},"2":{"wt":"km"}},"i":0}}]}' id="mw0w" typeof="mw:Transclusion">1 kilometre (0.62</span><span about="#mwt103" typeof="mw:Entity"> </span><span about="#mwt103">mi)</span> from the residential area hit.