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The European Commission has welcomed the Greek parliament's decision to approve tough new austerity measures. Economics commissioner Olli Rehn urged Greek officials to "take ownership" and fully implement the reforms, demanded by the EU in return for a huge bailout. But the measures attracted massive protests throughout Greece. Buildings were set on fire in Athens and police used tear gas to disperse the crowds. The government confirmed later that an election would be held in April. Analysts say the biggest party in the governing coalition, the socialist Pasok, is likely to suffer at the hands of the electorate. Greece is trying to secure a 130bn euro ($170bn; £110bn) bailout from the EU and IMF to prevent it defaulting on its massive debts. The deal, which has not yet been finalised, could write off around half of Greece's privately-held debt. The austerity measures were demanded by the European Union as a precondition for releasing the funds. Greece now has two days to meet two other EU demands: setting out exactly how it will make 325m euros of the promised savings, and giving written confirmation that the measures will be implemented regardless of the outcome of April's election. Read Gavin's thoughts in full European Union finance ministers are due to discuss their decision on the bailout package at a meeting on Wednesday. Athens has been criticised for failing to implement many of the pledges it made in the first round of austerity measures, prompting concern from some EU politicians that the cuts might not be put into effect. German Chancellor Angela Merkel hailed the vote as a "very important step" on the road to Greek stability, but insisted there "would not and cannot be any changes" to the austerity programme. Mr Rehn meanwhile said the EU continued to stand by the Greek people, and insisted that the reforms were needed to ensure future economic growth. "The Greek authorities and political forces should now take full ownership and make the case for the second programme and fully implement it in order to return the country to stable economic growth and job creation," he said. The EU has been the target of much anger among Greeks, who see the reforms as piling unnecessary hardship on ordinary people. Continue reading the main story “ Start Quote As ever, the biggest question mark of all - which was not a question at all for last night's rioters - is whether the Greek government is right in its assessment, that qualifying for sticking with the programme is still in the country's best interests ”