Police have been granted a further 30 hours to question a man arrested in connection with a double murder on Friday.
The 33 year-old was detained on Saturday shortly after police revealed the deceased – formally named on Sunday night as 42-year-old Finbar McGrillen and 40-year-old Caron Smyth – had been victims of a suspected domestic incident.
Their bodies were discovered in a flat in the Ravenhill area on Friday afternoon.
Detective Chief Inspector Una Jennings said she believed the perpetrator may have been in a relationship with one of the victims.
“We are treating this at the moment as a suspected domestic homicide,” she said.
The PSNI chief investigating officer added: “I would describe it as a domestic incident.
“We believe that the perpetrator of this crime may well have been in a relationship with one or other of the victims.”