Hundreds of protesters have clashed with riot police in central Kiev, after legislation that restricts the right to protest was passed.

Sunday’s clashes occurred shortly after tens of thousands rallied on Kiev’s main square, as part of anti-government protests which have rocked Ukraine for two months. A group of activists attacked riot police with sticks, trying to push their way toward the parliament building. Stun grenades were used and smoke was seen above the crowd.

Last week, President Viktor Yanukovych approved a number of laws that limit the Ukrainians’ rights to protest, civic activism and free speech. Opposition leaders have denounced the legislations as unconstitutional and called for the establishment of parallel governing structures in the country.