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epa05171245 British Prime Minister David Cameron leaves at the end of an extraordinary two days EU summit at EU headquarters in Brussels, Belgium, 19 February 2016. EU leaders were set to try to thrash out an agreement with Britain on reforms, amid hopes that they can seal a deal which will convince the country to stay in their bloc. Fears are rife that Britons might vote to leave the European Union in a referendum that Prime Minister David Cameron has promised to hold by the end of 2017, but that is widely expected this year already. The turmoil over Brexit - the buzzword for Britain's possible departure from the EU after more than 40 years of half-hearted membership - comes at a time when the bloc is already struggling with a severe migration crisis and enduring economic woes. EPA/OLIVIER HOSLET