President Barack Obama on Friday said the United States strongly supports Turkey's democratically elected government, but that any extradition request for a USA -based Muslim cleric accused of being involved in last week's attempted coup will have to go through normal channels.
Security forces detained his aide, Halis Hanci, in the Black Sea province of Trabzon, a senior official said, describing him as a "right-hand man" to 75-year-old Gulen and responsible for transferring funds for him.
In other crackdown measures, Turkey has disbanded the presidential guard after already detaining almost 300 unit members suspected of plotting against President Recep Tayyip Erdogan, and authorities detained Muhammet Sait Gulen, a nephew of the cleric who lives in self-imposed exile in Pennsylvania.
"There will no longer be a presidential guard, there is no goal, no need", he said in a televised interview with A-Haber TV.
President Erdogan has hit out at leaders from the European Union for its "prejudiced" attitude attitude to Turkey, while 1,200 soldiers detained after the coup bid have now been freed.
Turkey's government has repeatedly said the deadly plot on July 15, which resulted in the death of at least 246 people and injured more than 2,100 others, was organized by followers of US-based cleric Fetullah Gulen.
Gulen's presence in the United States has strained Turkey's ties with its North Atlantic Treaty Organisation partner which uses Turkish bases to strike Islamic State jihadists in Syria.
Amnesty has said Mr Erdogan is going "well beyond what might be considered a legitimate response to the coup attempt".
Nearly 300 of its officers had already been detained after some guards forced TV news presenters to read statements declaring martial law during the abortive coup attempt.
Gulen's nephew was reportedly detained in Turkey on Saturday, according to the AFP news agency.
The gazette statement also announced that 1,043 private schools and 1,229 associations and foundations will be shut down under the state of emergency.
"We are very surprised that our allies have not come to Turkey to visit even after one week has passed", Omer Celik told reporters.
His critics fear he is using the abortive coup to wage an indiscriminate crackdown on dissent.
The decree, which local media noted as being the first taken under the powers of the recently-declared state of emergency, also extends the legal time a person can be detained to 30 days.
Due to that, the US President, Barack Obama, asked for real proofs that show the participation of Gulen in the insurgent activities occurred last week, since Turkish Foreign Minister, Mevlut Cavusoglu, affirmed Turkey was in negotiations and expected to complete the Gulen's extradition to open a trial in Turkey because of his subversive actions. He also claimed that his supporters are being framed in what he says may have been a provocation false-flag staged by Erdogan himself. Some 179 civilians, 62 police and 5 soldiers who opposed the soldiers also died and have been hailed as "martyrs".