istanbul turkish authorities monday issue arrest warrant 107 teachers suspect tie u.s.-based cleric ankara blame orchestrate last year coup dogan news agency say fifty-one teachers detain ankara local prosecutor issue warrant dogan say add operations continue round-up remain teachers teachers previously suspend job part ongoing crackdown follow attempt coup july 2016 say turkey blame fethullah gulen cleric live self-imposed exile pennsylvania since 1999 last year fail coup gulen deny involvement denounce coup 50,000 people jail pending trial crackdown 150,000 people include military personnel teachers public servants sack suspend job government dismiss right group concern crackdown say purge could neutralize threat represent gulen network say infiltrate judiciary army school institutions turkey detain 51 teachers suspect link coup dogan