A series of <a href="https://en.wikipedia.org/wiki/7_July_2005_London_bombings" id="mwASo" rel="mw:WikiLink" title="7 July 2005 London bombings">four explosions</a> occurs on <a href="https://en.wikipedia.org/wiki/Transport_in_London" id="mwASs" rel="mw:WikiLink" title="Transport in London">London's transport system</a>, killing 56 people, including four <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Suicide_bombers" id="mwASw" rel="mw:WikiLink" title="Suicide bombers">suicide bombers</a>, and injuring over 700 others.