U.S. President Barack Obama urged all sides in Turkey to support the democratically elected government.
Either arrest Fethullah Gulen or return him to Turkey. A Turkish official, speaking on condition of anonymity in line with government regulations, said Turkey was preparing a formal extradition application.
Members of Turkey's armed forces declared hours earlier that they had taken control of the country as explosions, gunfire and a reported air battle between loyalist forces and supporters of the coup erupted in Ankara, the capital.
Fadi Hakura, a Turkey expert at the Chatham House think tank in London, said the attempted coup appeared to have been "carried out by lower-ranking officers". Thousands of military officers and members of the judiciary have been arrested or fired, and officials are promising to extend the purge.
President Barack Obama urged parties on all sides of the crisis in Turkey on Saturday to avoid destabilizing behavior and follow the rule of law, a day after a coup attempt against President Tayyip Erdogan rocked US efforts to combat the Islamic State militant group (ISIS).
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It appears not to have been backed by the most senior ranks of the military, and Turkey's main opposition parties quickly condemned the attempted overthrow of the government.
USA and North Atlantic Treaty Organisation forces also operate in other locations outside of Incirlik, and Pentagon officials said in April that they were deploying a powerful mobile rocket system known as HIMARS, or High Mobility Artillery Rocket System, to an undisclosed location in Turkey's southwest to support Kurdish and Arab rebels in Syria.
He said that "government should be won through a process of free and fair elections, not force". On Saturday, President Obama reiterated the United States's "unwavering support for the democratically elected, civilian government of Turkey", according to a statement. He and Erdogan were formerly allies but became estranged in recent years. Soldiers also stormed the streets in military tanks and torched government buildings. But Erdogan's government is blaming the chaos on the cleric, who lives in exile in Pennsylvania and promotes a philosophy that blends a mystical form of Islam with staunch advocacy of democracy, education, science and interfaith dialogue.
After more than 2,000 people connected to the coup had been detained, Erdogan said that he vowed that those responsible "will pay a heavy price for their treason", according the Associated Press.
Erdogan has always been angered by USA support for various Syrian Kurd factions fighting ISIS in northern Syria, fighters the Turkish government considers one and the same as the PKK, a rebel group which has fought to establish a Kurdish homeland in southeastern Turkey and been blamed for bloody attacks against both civilians and security personnel. Dundar said at least 104 "coup plotters" had died.
"Not only is the government unstable but the military is also unstable", Stein said, which could lead to more trouble, more fractures, and increased instability for the North Atlantic Treaty Organisation member.
FILE - In this September 24, 2013 file photo, Turkish Islamic preacher Fethullah Gulen is pictured at his residence in Saylorsburg, Pa.
He also said the USA military was working to adjust its counter-ISIS operations "to minimize any effects on the campaign".
The United States is monitoring the situation closely, in part because it stages air strikes from Turkey's Incirlik air base against Islamic extremists in Syria and Iraq.
Although he didn't outline any threat, Erdogan's emphasis on U.S.