Turkish news reports say a suspect has been arrested in the attack on an Istanbul nightclub that killed 39 people on December 31.
Reports say Abdulkadir Masharipov was detained Monday in Istanbul's Esnyurt district.
Turkey's nationwide NTV and other media outlets said the suspect was seized in a raid on a house in the district where he had been staying with a friend from Kyrgyzstan. Five others in the house also were detained, including three women.
That report said police discovered the suspect's whereabouts last week, but delayed the raid to monitor his movements and contacts.
Police were expected to release additional details in a Tuesday morning news conference.