CHISINAU (AFP) - Thousands of young protesters stormed the parliament and presidency in Moldova Tuesday after a rally against a Communist election victory boiled over into violence in Europes poorest country. Moldovas ruling Communists, the first Communist Party to win power in the former Soviet Union, swept weekend legislative elections by winning half the vote, according to official estimates. But the liberal opposition denounced the results as flawed and around 15,000 demonstrators turned out in the streets for a second day, hurling stones at the presidency and burning Communist flags. Communist President Vladimir Voronin, due to step down on April 7 after serving a maximum two consecutive terms, accused protesters of trying to organise a coup detat. Voronin also called on Western structures to intervene in resolving this situation, hitting out at protesters for their uncivilized methods, involving violence, acts of vandalism in state offices and profanation of state symbols. He reminded a gathering of foreign ambassadors that international monitors from the OSCE had found the April 5 elections free and fair. The opposition, although taken aback by protests initiated by youth groups rather than established political factions, vowed that such actions would continue until their demands were met. Vlad Filat, leader of the Liberal Democrats, said he and other liberal opposition leaders later held talks with the government but failed to reach agreement on their main demand for a recount of the election. We have not received an official answer. Therefore our action will continue and we call on our supporters to behave in a civilised fashion and not give into provocation. Police used water cannon and tear gas but protestors still managed to enter the presidency and hoisted a European Union flag. They also dragged furniture out of the parliament building and set it on fire, filling the air with thick black smoke. Some 100 people including both protestors and police were injured in the clashes, the head doctor at Chisinaus emergency hospital told AFP. Demonstrators, who included many supporters of liberal opposition parties defeated in Sundays elections, shouted slogans including Freedom and Down with the Communists, the correspondent said. They burned Communist Party flags and the flag of the Soviet Union and shouted We want to join Europe and We are Romanians. Romanian is the official language of Moldova, which was part of Romania in the inter-war period before being annexed by Soviet leader Joseph Stalin in World War II to become part of the USSR. International leaders urged calm. UN chief Ban Ki-moon called on all parties to refrain from violence and maintain calm. Violence against government buildings is unacceptable, said EU foreign policy chief Javier Solana. Equally important is the respect for the inalienable right of assembly of peaceful demonstrators. Russian President Dmitry Medvedev spoke Tuesday with Voronin by telephone, urging him to find a quick and peaceful resolution to the crisis in his country, the Kremlin said. Most demonstrators appeared to be under 25, many of them first-time voters in Sundays polls and patently disillusioned by the result. Many had learned about the rally in an SMS text message campaign. The protests had started on Monday with a gathering of thousands of people in central Chisinau organised by a youth-led umbrella protest group called I am An Anti-Communist. Voronins Communist Party of Moldova (PCRM) won around 50 percent of the vote in the parliamentary elections, which the Organization for Security and Co-operation in Europe (OSCE) said met many international standards. The Communist victory in the legislative elections means it should have enough seats to choose the next president. Analysts expect Voronin to maintain a considerable influence. The Communists were followed in a distant second place by the Liberal Party, Liberal Democrats and Our Moldova parties, who won around 35 percent of the votes between them. The Communists, who have pledged to build a European Moldova while also maintaining friendly ties with Moscow, came to power in 2001 and were re-elected in 2005. Moldova is a predominantly agricultural country of 4.3 million people where the average monthly wage is only 253 dollars. Over a quarter of its active population works abroad and their remittances are vital for its economy.