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By Ayla Jean Yackley ISTANBUL (Reuters) - A Turkish court on Saturday ordered the formal arrest of 12 more police officers, including the former head of Istanbul's intelligence unit, pending charges they may have illegally wiretapped Prime Minister Tayyip Erdogan, media said. The detention of 115 police officers in overnight raids earlier this week ratcheted up a power struggle between Erdogan and his erstwhile ally, Fethullah Gulen, an influential Islamic scholar based in Pennsylvania, whose followers took up key posts in the police and judiciary during Erdogan's 11 years in power. Fuat Ali Yilmazer, who oversaw intelligence for Istanbul police and is accused of forming and leading a criminal gang, was among those formally arrested, CNN Turk reported. He has accused them of a litany of crimes, including organizing 2013 mass anti-government protests and using the corruption charges in an attempt topple him in a coup.