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| Fethullah Gulen is now a fierce opponent of Turkey's leadership, especially President Recep Tayyip Erdogan |
Mr Gulen, who is based in the US, is accused of establishing and running an "armed terrorist group".
He was once an ally of Turkish President Recep Tayyip Erdogan but has now been accused of plotting to overthrow the Turkish government - a claim the cleric strongly denies.
The US is thought to be unlikely to act on any extradition request.
The move comes amid a national crackdown on perceived supporters of the cleric.
Over 20 journalists working for media outlets thought to be sympathetic to the Gulen movement were arrested last weekend.
Eight of them were freed on Friday on the orders of a court in Istanbul. Those released include Ekrem Dumanli, editor-in-chief of Zaman newspaper.
Four others, including a TV station boss, remain in custody. » | Friday, December 19, 2014
