The mass shooting at an Istanbul nightclub on New Year's Eve was carried out professionally with the involvement of an intelligence organization, Turkish Deputy Prime Minister Numan Kurtulmus said on Monday.
"It appears the Reina attack is not just a terrorist organization's act, but there was also an intelligence organization involved," Kurtulmus said during an interview with broadcaster A Haber. "It was an extremely planned and organized act."
PHOTOS: Scenes of Chaos and Mourning After Istanbul Attack
A gunman killed 39 people at Istanbul's Reina nightclub, a swanky venue by the Bosporus where scores of people had gathered to celebrate the New Year.
The suspect opened fire with an automatic rifle, throwing stun grenades to allow himself to reload and shooting the wounded on the ground.
Turks and visitors from several Arab nations, India and Canada were among the victims.