Amsterdam said he and his firm "have attempted repeatedly to warn the USA government of the threat posed" by Gulen and his movement.
He urged all parties to ensure the safety and well-being of diplomatic missions and personnel and civilians throughout Turkey. We do not want the same hardships to be relived. We claim our republic and our democracy; protect our belief absolutely. Soldiers blocked major bridges in Istanbul.
About 280 of them are still in jail pending trial, the agency said.
Two bridges in Istanbul are closed in one direction by the military.
Turks appeared to heed that call early Saturday marching through the streets of Izmir and Istanbul, waving Turkish flags and gathering in the main square in the capital, Ankara. Other clashes and explosions have also been heard in the city.
Social media outages: Facebook, Twitter and YouTube all experienced interruptions or outages. The president has said the coup is over but reports of explosions and gunfire are still coming in from the capital Ankara and Istanbul and it isn't clear who is in control of these cities.
Tanks opened fire around the Turkish parliament building, Reuters reported. He said military jets had taken off from an air base in Eskisehir, east of Ankara.
All flights canceled: While a few flights have landed in the last hour, Turkish airlines flight status boards shows that all flights out of Istanbul have been canceled or marked indefinitely delayed for tonight.
Television pictures showed tanks deployed outside Atatürk Airport in Istanbul.
Erdogan and other officials blamed loyalists of a US-based cleric for the coup attempt; his movement denied any part in it.
In a separate statement, Kerry said the US viewed the "very fluid situation" in Turkey with the "gravest concern". Events on the ground are moving quickly and it would be irresponsible for us to speculate on them.
At roughly the same time that Erdogan's plane touched down, employees of CNNTürk said that rebel soldiers stormed their studios and forced them to stop broadcasting. Minutes later, the camera showed an empty studio.
In a FaceTime interview with CNN Turk, Erdogan called on his supporters to gather in the country's squares and airports.
"Go to the streets and give them their answer", Erdoğan urged as the reporter held up her phone to the network's camera.
"In essence, an Islamist faction within the military that has deeply alienated the secular strongmen within the armed forces is the one leading the challenge against Erdogan", Stratfor said in an analysis released on Saturday. Rinuh Yilmaz, press officer to the National Intelligence Organization, told CNN Turk that "the coup is defeated". Erdogan said he would swiftly return to Ankara. He said the government remains in control and that an attempted mutiny by junior officers has been thwarted.
Yildirim didn't provide details at the time, but said Turkey would never allow any "initiative that would interrupt democracy". That policy, according to analysts, backfired when Turkey took on a more active role in the USA -led coalition against the extremists, who have since been blamed for a series of deadly bombings on Turkish soil.
The military of North Atlantic Treaty Organisation member Turkey is a key partner in US -led efforts to defeat the Islamic State group, which controls territory in Syria and Iraq, and has allowed American jets to use its Incirlik air base to fly missions against the extremists. NATO Secretary-General Jens Stoltenberg also said he spoke to Cavusoglu and called for respect for democracy.
He said: "We're really anxious as to how we'll get home on Sunday".
The announcement said a "peace council" had been established to maintain order and that a new constitution would be prepared as soon as possible. Our Embassy is monitoring the situation closely. You should stay indoors and avoid unnecessary travel.