Turkey's allies, fellow NATO member nations and world leaders swiftly reacted Friday to an attempted coup Friday night, which could spur immense implications, not only in the Middle East, but also in the West.
"The United States views with gravest concern events unfolding in Turkey," said Secretary of State John Kerry.
He said the State Department was "monitoring a fluid situation," and "emphasized the United States' absolute support for Turkey's democratically-elected, civilian government and democratic institutions."
The U.S. State Department urged U.S. citizens in Turkey to shelter in place during the attempted coup.
President Barack Obama had been briefed on the situation. "The president and secretary agreed that all parties in Turkey should support the democratically-elected government of Turkey, show restraint and avoid any violence or bloodshed," a White House statement said.
NATO Secretary General Jens Stoltenberg wrote in a tweet that he spoke with the Turkish foreign minister. "I call for calm, restraint & full respect for Turkey's democratic institutions and constitution," Stoltenberg wrote, without saying what actions, if any, NATO would take. Turkey joined NATO in 1952.
United Nations Secretary-General Ban Ki-moon appealed for calm as the world body sought to clarify the situation, said a U.N. spokesman.
"The Secretary-General is closely following developments in Turkey. He is aware of the reports of a coup attempt in the country. The United Nations is seeking to clarify the situation on the ground and appeals for calm," said spokesman Farhan Haq.
Britain's government was also monitoring the turmoil. "We are concerned by events unfolding in Ankara and Istanbul. Our Embassy is monitoring the situation closely," a British foreign ministry spokeswoman said.
British Foreign Minister Boris Johnson also said he was "very concerned."
The foreign minister of Turkey's neighbor to the east said he was "deeply concerned about the crisis in Turkey."
"Stability, democracy & safety of Turkish people are paramount. Unity & prudence are imperative," Iranian Foreign Minister Javad Zarif wrote in a tweet.
Slovakia, which holds the rotating European Union presidency, said on Saturday it was following the events unfolding in Turkey with serious concern, and was coordinating appropriate reaction with EU partners.
"Foreign Minister Miroslav Lajcak has been in intensive contact all evening with EU high foreign affairs representative Federica Mogherini and other European colleagues," the Foreign Ministry said in a statement.
"He has also been in contact with partners in the Turkish government with the aim to clarify the situation in Turkey and discuss steps that the EU should take with the aim to maintain and support democracy and stability in the country."
EU foreign policy chief Federica Mogherini said she was "in constant contact with EU delegation in Ankara and Brussels from Mongolia." She called for "restraint and respect for democratic institutions."
The Kremlin said it was gravely concerned. Kremlin spokesman Dmitry Peskov told reporters on a conference call that President Vladimir Putin was being kept constantly updated on the situation in Turkey.
Peskov said events were moving too fast to fully understand what was happening, but he said Russia was concerned and wanted to see Turkey return to the path of stability and order, and for there to be a lawful outcome. He said that, whoever was now in charge in Turkey, it was incumbent on them to ensure the safety of Russian nationals.
The French ambassador to the U.S., Gérard Araud, said he was asked about the mayhem in Turkey as he was talking about Thursday's devastating terror attack in France. "On TV for #NiceAttack and asked about #TurkeyCoup, only possible answer: call for respect of constitutional order," he tweeted.