The Lib Dems said the move by the Conservative Party during the ITV leaders' debate was “straight out of Donald Trump or Putin’s playbook”.
A dozen protesters reportedly tried to flee through the university’s sewerage system, but failed to get out of the building.
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The Labour MP said demonstrators arguing against LGBT lessons had a "just cause".
Labour MPs have voiced concern, with one saying “it shows that anti-Semitism is becoming normal in the party”.