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By Dasha Afanasieva ISTANBUL (Reuters) - Tens of thousands of mourners chanting anti-government slogans marched through central Istanbul on Wednesday for the funeral of a teenager wounded in street protests last summer whose death has sparked renewed unrest across Turkey. Riot police fired water cannon and tear gas at protests in several cities after Berkin Elvan's death on Tuesday, adding to pre-election woes for Prime Minister Tayyip Erdogan as he battles a corruption scandal that has become one of the biggest challenges of his decade in power. Crowds chanting "Tayyip! Killer!" and "Everywhere is Berkin, everywhere is resistance" held up photos of Elvan outside a "cemevi", an Alevi place of worship, in Istanbul's working class Okmeydani district, from where his coffin, draped in red and covered in flowers, was carried through the streets for burial.