Four miners are killed in the <a href="https://en.wikipedia.org/wiki/Gleision_Colliery_mining_accident" id="mwAYI" rel="mw:WikiLink" title="Gleision Colliery mining accident">Gleision Colliery mining accident</a> in the Swansea Valley, Wales, UK.<sup about="#mwt64" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-10"}}' id="cite_ref-10" rel="dc:references" typeof="mw:Extension/ref"><a href="./September_15#cite_note-10" id="mwAYM" style="counter-reset: mw-Ref 10;"><span class="mw-reflink-text" id="mwAYQ">[10]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-10"><cite about="#mwt61" class="citation web cs1" id="mwCDw"><a class="external text" href="https://www.itv.com/news/wales/2021-09-15/gleision-ten-years-since-the-mining-disaster-that-left-four-men-dead" id="mwCD0" rel="mw:ExtLink nofollow">"Gleision: Family call for inquest into mining disaster ten years on"</a>. <i id="mwCD4">ITV News</i>. 2021-09-15<span class="reference-accessdate" id="mwCD8">. Retrieved <span class="nowrap" id="mwCEA">2021-09-16</span></span>.</cite><span about="#mwt61" class="Z3988" id="mwCEE" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=unknown&amp;rft.jtitle=ITV+News&amp;rft.atitle=Gleision%3A+Family+call+for+inquest+into+mining+disaster+ten+years+on&amp;rft.date=2021-09-15&amp;rft_id=https%3A%2F%2Fwww.itv.com%2Fnews%2Fwales%2F2021-09-15%2Fgleision-ten-years-since-the-mining-disaster-that-left-four-men-dead&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ASeptember+15"></span></span>