>> Bruised and bloodied, this is the man Turkish authorities have been hunting for over two weeks. The suspected gunman who killed 39 people in Istanbul's Reyna nightclub in the early hours of New Year's day, identified as Abdulgadir Masharipov. He was captured in a raid on an apartment in an outlying suburb of Istanbul along with four others.
> His cover name is Ebu Muhammed Horasani Abdulkavi.>> He was born in Uzbekistan in 1983. He was trained in Afghanistan.
He is a well educated terrorist who speaks four languages. Sahin says authorities suspect he entered Turkey illegally in January and is linked to jihadist group Islamic State.>> It is clear that this attack was carried out for Daesh. Reuter's Turkey Bureau Chief Nicholas Tedesal says the arrest is an important breakthrough for police.
>> The government had changed addresses in Istanbul several times, both before the attack and after it, which had clearly helped him to evade this massive manhunt for two weeks. So it really has been a massive operation. And, clearly, the authorities are very pleased that, after all of those efforts, they've been able to find the man who they believe was the gunman in the attack on New Year's Day.
>> Islamic State has been blamed for at least half a dozen attacks on civilians in the country over the past 18 months. But apart from assassinations, this is the first attack it has claimed directly. Masharipov Is still in custody in Istanbul's police headquarters. 50 people have been detained in raids on 152 addresses since the shooting.