A court in Turkey has issued a formal warrant for the arrest of US-based Muslim cleric Fethullah Gulen, who the government accuses of being behind the failed coup that left more than 270 people dead.
An Istanbul-based court issued the warrant for "ordering the July 15 coup attempt", the state-run Anadolu news agency said.
The government says Mr Gulen, a former ally of President Recep Tayyip Erdogan who lives in self-imposed exile in Pennsylvania, masterminded the failed coup attempt by renegade officers in Turkey's military and wants him extradited to Turkey.
Mr Gulen has denied involvement or prior knowledge of the coup attempt.
Ankara has not yet made a formal extradition request, but the arrest warrant could be the prelude.
Washington has asked for evidence of the cleric's involvement and has said the extradition process must be allowed to take its course.
Turkey has designated Mr Gulen's movement, which runs charities, schools and businesses across the world, as a terrorist organisation and has launched a widespread crackdown on suspected members since the failed coup.
Since the coup attempt, nearly 70,000 people have been suspended or dismissed from jobs in the civil service, judiciary, education, healthcare, the military and the media.
About 18,000 people have been detained or arrested, mostly from the military, on suspicion of being involved in the failed coup.
Earlier, Mr Erdogan vowed to go after businesses linked to Mr Gulen's movement.
"Without doubt, this organisation has an extension in the business world. Maybe it is what they are most powerful at," he said during a speech to the heads of chambers of commerce in Ankara.
"We are determined to totally cut off all business links of this organisation, which has blood on its hands."
The president said that every penny that goes to the Gulen movement "is a bullet placed in a barrel to be fired against this nation. In the same way that we do not pardon those who fire the bullet, we will not forgive those who financed the bullet".
Mr Erdogan added that the purge of the military would continue.
"After July 15, this sneaky organisation's structure in the Turkish armed forces has started to be uncovered," he said.
"For now, those who are captured are the tip of the iceberg. Efforts are continuing for others."
Separately, the deputy chairman of Turkey's ruling Justice and Development Party, Mehdi Eker, said countries around the world need to take action against schools or other establishments linked to Mr Gulen.
Mr Eker said the cleric's movement had hundreds of schools, charities or other establishments in more than 100 countries and warned they too could face "security risks" from the group in the future.
"If we had seen that these schools were not innocent educational nests but nurseries raising members for a terror organisation, we would not have lived through the (attempted coup)," he told journalists in Ankara.
"It is our responsibility to warn countries that have (Gulen-linked) schools," Mr Eker said. "In Africa, we know that they work as nurseries (for terror) and we want to warn them."