Turkey\'s prime minister has threatened protesters that if they don\'t leave Istanbul\'s Taksim Square, security forces \"know how to clear it.\" According to dpa, Recep Tayyip Erdogan was speaking at a rally of tens of thousands of supporters in the Ankara suburb of Sincan. Erdogan warns: \"I say this very clearly: either Taksim Square is cleared, or if it isn\'t cleared then the security forces of this country will know how to clear it.\"