Men lay flowers outside the Reina nightclub by the Bosphorus, which was attacked by a gunman, in Istanbul, Turkey, on Jan. 1, 2017. Reuters/Umit Bektas

Further details are beginning to emerge regarding a terror attack in Turkey Sunday that killed at least 39 people and injured dozens more after a gunman opened fire in an Istanbul nightclub. Victims have been identified from at least 12 countries, while there is an ongoing manhunt for the shooter.

Early reports indicate most of the dead in the shooting were citizens of other countries. Turkey's state-run news agency, Anadolu, reported that 24 of the 39 victims were foreign nationals, via the Associated Press. The AP also reported, citing a diplomat, that one of the dead and five of the injured were Kuwaiti.

Agence France-Presse (AFP) put together a list of what is known thus far about the victims, citing local news sources and officials from a number of countries. Early reports, via AFP, indicated five Saudis, three Jordanians, three Iraqis, three Lebanese, two Tunisians, two Indians, one Israeli, a Belgian-Turkish dual national, a French-Tunisian dual national, one Libyan and three Moroccans were among the dead. Some 70 others were injured in the attack, many of whom were from the countries listed above.

There were as many as 600 people celebrating New Year's in the Reina nightclub when a lone attacker entered and began shooting at around 1:15 a.m., according to the New York Times. No group has yet claimed responsibility for the attack.

President Recep Tayyip Erdogan offered his condolences to the victims of the shooting, including "foreign guests."

"Turkey continues its combat against terror and is absolutely determined to do whatever is necessary in the region to ensure its citizens safety and peace," he said in a statement, via Al Jazeera.

Not much was known about the attacker Sunday afternoon, while officials denied reports that the shooter was dressed as Santa Claus. "There is no truth to this. He is an armed terrorist as we know it," Prime Minister Binali Yildirim told reporters, via the Times.