US invites Turkey to present any Gulen coup evidence

Speaking in Luxembourg, Kerry said Washington had not yet received a formal extradition request for the expatriate cleric, but added: "We fully anticipate that there will be questions raised about Mr Gulen."

Gulen, a reclusive Islamic preacher with a worldwide following who is regularly accused of leading a behind the scenes role in Turkish politics, lives in a small town in the Pocono Mountains of the US state of Pennsylvania.

He has been accused by Turkish President Recep Tayyip Erdogan of being behind Thursday's bloody coup attempt, although he himself has denied any role and condemned the military uprising "in the strongest terms."

Kerry who spoke late Friday to his Turkish opposite number Mevlut Cavusoglu by telephone, said: "We haven't received any request with respect to Mr Gulen.

"And obviously we invited the government of Turkey, as we always do, to present us with any legitimate evidence that withstands scrutiny and the United States will accept that and look at it and make judgements about it appropriately."

Standing alongside Luxembourg's Foreign Minister Jean Asselborn outside the country's foreign ministry, Kerry told reporters: "I'm confident that there will be some discussion about that."

Gulen, 75, was once a close Erdogan ally but the two fell out in recent years as Turkey's leader became suspicious of Gulen's movement, Hizmet, and its powerful presence in Turkish society, including the media, police and judiciary.

The preacher moved to the United States in 1999 and has since led a secluded life in Pennsylvania, declining interviews and rarely making public appearances. He has been charged with treason in his native country.

Speaking more broadly about the situation in Turkey, Kerry said he understood that a measure of calm had returned after the dramatic events and that all US embassy personnel had been accounted for.

"The United without any hesitation squarely and unequivocally stands for democratic leadership, for respect for a democratically elected leader ... and we stand by the government of Turkey," Kerry said.

Washington's top diplomat said that the embassy was seeking to confirm that no US citizens travelling in Turkey had been harmed, and expressed US condolences to the relatives of the more than 250 Turks estimated to have died.

He expressed Washington's hope "that in the immediate hours things will remain calm, that there will be a constitutional process and a legal process that will deal with coup plotters."

He said that, so far, the crisis in Turkey had not affected the country's cooperation with the rest of the NATO alliance nor its role as part of the US-led coalition fighting the Islamic State in neighboring Turkey.

"I'm sure that people will wonder about allegations of who may have instigated this and where the support came from," Kerry said, in a nod to the accusations swirling around Gulen and his alleged supporters in the Turkish military.