Pro-Russia demonstrators have stormed the local headquarters of Ukraine’s security service in the eastern city of Donetsk.<br /><br /> They urged police to quit rather than cooperate with the new authorities in Kyiv and demanded the release of a jailed former official.<br /><br /> Many believe their part of the country should also have a chance to vote on breaking away.<br /><br /> One woman said that a referendum should have four options:<br />“Federation, confederation, the south-east remaining in Ukraine, or joining Russia. All people’s views should be taken into account,” she said.<br /><br /> But others in Donetsk want their city to stay part of Ukraine. Some demonstrating in favour of this say they have been attacked by pro-Moscow activists.<br /><br /> “They threw stones and grenades at us, beat us with sticks and used tear gas,” said one man. “When we got into the bus, everyone was injured.”<br /><br /> A Ukrainian nationalist was stabbed to death when pro-Russia and pro-Ukraine demonstrators clashed in Donetsk on Thursday. Some believe Moscow could use the unrest as a pretext for military intervention.<br /><br /> Our correspondent in the city, Angelina Kariakina, says that the situation remains tense with pro-Russian activists rallying <br />and demanding more regional autonomy. <br /><br /> “At the same time, supporters of the Independence Square movement are in shock after being attacked as they demonstrated in support of a united Ukraine,” she said. “They believe there’s an attempt to spread fear in Donetsk and across the region.”