Ukraine’s ex-interior minister turned opposition leader has been injured in a scuffle between police and anti-government activists in the nation’s capital.

Yuri Lutsenko, a top organizer of the mass protests that have gripped Kiev for weeks, was injured in the early hours of Saturday when he tried to intervene in a confrontation between riot police and opposition activists. The clashes erupted outside a Kiev court had set long prison terms for three ultra-nationalist activists convicted of planning to blow up a statue in 2011.

Ukraine’s top human rights official said 11 people were hospitalized after the clashes.