Nine <a href="https://en.wikipedia.org/wiki/Czechs" id="mwvw" rel="mw:WikiLink" title="Czechs">Czech</a> students are executed as a response to anti-<a href="https://en.wikipedia.org/wiki/Protectorate_of_Bohemia_and_Moravia" id="mwwA" rel="mw:WikiLink" title="Protectorate of Bohemia and Moravia">Nazi</a> demonstrations prompted by the death of <a href="https://en.wikipedia.org/wiki/Jan_Opletal" id="mwwQ" rel="mw:WikiLink" title="Jan Opletal">Jan Opletal</a>. All Czech universities are shut down and more than 1,200 students sent to <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Concentration_camp" id="mwwg" rel="mw:WikiLink" title="Concentration camp">concentration camps</a>. Since this event, <a href="https://en.wikipedia.org/wiki/International_Students'_Day" id="mwww" rel="mw:WikiLink" title="International Students' Day">International Students' Day</a> is celebrated in many countries, especially in the Czech Republic.