The Islamic State of Iraq and the Levant (ISIL) militant who staged an attack on Istanbul’s Reina nightclub in the early hours of Jan. 1 looks like a professional who received military training on how to use a weapon, according to security experts. Police have released the first footage of the Reina attacker, who killed 39 people and wounded 65 others, with initial police reports suggesting he may be from Uzbekistan or Kyrgyzstan. Officials are also investigating the possibility that the attacker may be from Xinjiang in eastern China and aged around 25, according to a report in daily Habertürk. It is still unclear how many minutes the attacker spent inside the club before fleeing. He went upstairs after entering Reina and started firing on revelers, before going downstairs to continue shooting.