Istanbul Governor Vasip Sahin told reporters Tuesday morning that the suspect in the attack on the city's Reina nightclub has confessed.
Sahin identified the suspect as Abdulgadir Masharipov, born in 1983, a national of the Central Asian country of Uzbekistan.
"The terrorist has admitted to his crime, and his fingerprints also matched those found on the scene," Sahin said.
Sahin said there are strong indications Masharipov was acting on behalf of the Islamic State and had entered Turkey illegally on its eastern border.
"He's received training in Afghanistan and speaks four languages," said Sahin, "a terrorist that has been well brought up."
The governor described an exhaustive manhunt involving the viewing of some 7,200 hours of video footage and the use of 2,000 police officers supported by Turkish intelligence.
The search extended to central Anatolia and the Aegean coast. Sahin said 150 raids led to the detention of 50 people, two of whom were arrested and will face charges.
There was speculation Marashipov had fled the country, perhaps to Syria. But ultimately he was arrested in an Istanbul suburb Monday night. Four others were taken into custody with him.
The attack occurred early New Year's Day in an upscale nightclub overlooking the Bosporus Strait. A gunman, apparently acting alone, killed 39 people and wounded dozens more. Most of the dead were foreigners.
A photograph of Masharipov released by the government after his arrest shows him with an apparently bruised and bloodied face.
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