The main suspect behind the deadly attack on an Istanbul Reina nightclub during new year's celebrations was arrested late Monday, according to security sources.

Abdulgadir Masharipov was captured during a police operation on a residence in Istanbul's Esenyurt district, the sources, who spoke on condition of anonymity due to restrictions on talking to the media, told Anadolu Agency.

Four other people, including a man of Kyrgyz origin and three women, were detained along with Masharipov.

Operations against other potential terrorist cells were underway early Tuesday, the sources added.

The sources added At least 39 people, including a police officer, were killed when an attacker opened fire on partygoers at the Reina nightclub in the Ortakoy district in the early hours of New Year’s Day; 69 other people were also hurt, with a number of foreign nationals among the casualties.