Three days after the event, Turkish authorities are yet to name the prime suspect in the deadly New Year nightclub shooting.
Raids in Istanbul and the detention of two foreign nationals at Ataturk Airport have brought the total number of arrests to 14, according to state media.
But the gunman remains at large.
A selfie-style video recorded by the prime suspect has surfaced online, fuelling speculation over the shooter's identity.
Social media, Turkish media and some international tabloids have named a 28 year-old man from Kyrgyzstan as the attacker, with a photo of his passport widely circulated.
But it has since been reported the man was not even in Turkey at the time of the attack.
As the search continues, locals at a makeshift memorial outside the club say they no longer feel safe.
"They have to work harder on security, we don't want any more deaths."
"It is very hard to feel safe, for sure it will be over one day. The important thing is that nothing happens to our people. We will deal with this."
Hundreds of Turks gathered to protest against the violence, walking through the city holding red flowers.
One protestor says Turkey needs to defend its secular identity.
"The only way to get over this kind of situation is to bring more democracy, freedoms, peace and the institutionalisation of secularism."
A man opened fire inside Istanbul's popular Reina nightclub shortly after midnight on New Year's Eve.
Thirty-nine people were killed; more than half were foreigners.
The so-called Islamic State militant group has since claimed responsibility for the attack, saying it was retaliation for Turkey's military incursion in Syria.
Turkish prime minister Binali Yildrim has hailed as a success his country's ongoing campaign against IS, also known as Daesh.
"Today it is the 133rd day of operation Euphrates Shield. By now, 1,270 Daesh militants were neutralised in the operations. The total number is 1,561, with those who were captured. The world talks about Daesh all the time. They wake up with Daesh and go to bed with Daesh. They are pretending to fight against Daesh. Turkey is the only one fighting."
One Turkish security source reportedly said the gunman himself may have trained in guerrilla warfare in Syria.
The shooter is believed to have used a Kalashnikov automatic rifle and reloaded it six times during the shooting.
