The number one suspect in the failed coup attempt - the Muslim cleric Fethullah Gulen - remains in the United States and has consistently denied involvement.
International observers are expected to give their verdict on Monday, which could embolden or weaken the opposition's case and determine how Turkey's western allies will respond.
The Government of Turkey has called on the Nigerian Government to shut down schools and other establishments in the country purportedly owned by Turkey as these organizations were owned by suspected terrorists.
Turkish President Recep Tayyip Erdogan has flown in to Istanbul, after an army group said it took over the country.
The group had declared that a "peace council" now ran the country and there was a curfew and martial law.
