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By Daren Butler ISTANBUL (Reuters) - Prime Minister Tayyip Erdogan accused protesters on Thursday of trying to sow chaos to influence local elections after Turkey's worst day of civil unrest since anti-government demonstrations swept the nation last summer. Late on Wednesday, a man in Istanbul was shot dead and a police officer in eastern Turkey suffered a fatal heart attack. Erdogan said demonstrators had "burned and destroyed" offices of his ruling AK Party in Istanbul. These are charlatans, they have nothing to do with democracy, they do not believe in the ballot box," Erdogan said at an opening ceremony for an underground train line in the capital Ankara.