Turkey has formally arrested 32,000 people in its investigation of a religious movement the government blames for staging a military coup attempt on July 15, Justice Minister Bekir Bozdag said on Wednesday.

In a live interview with broadcaster NTV, Bozdag also said a total of about 70,000 people have faced legal proceedings on suspicion of links with U.S.-based cleric Fethullah Gulen, whom the government says engineered the failed coup.

The 75-year-old Gulen, who lives in Pennsylvania, denies any involvement. Turkey is building a new courthouse in the town of Sincan, near the capital Ankara, and needs more facilities in order to prosecute all of the Gulen followers implicated in the coup plot, Bozdag said.

US- Turkey Extradition- Q&A

In this July, 2016 file photo, Islamic cleric Fethullah Gulen speaks to members of the media at his compound, in Saylorsburg, Pa. Turkey has said the U.S. is legally bound by a treaty to immediately hand over Gulen. (Chris Post/The Associated Press)

Turkey deems the Gulen movement as a terrorist organisation.

U.S. officials have told their Turkish counterparts they will respond within a couple of days to Turkey's demand to arrest Gulen, Bozdag said.

Turkey wants the United States to extradite Gulen and prosecute him. Washington has said it is cooperating with Ankara on the matter and asked its NATO ally for patience as it processes the extradition request for Gulen to meet U.S. legal requirements.