A 49-year-old man has been arrested on suspicion of murder after a woman died in the early hours of the morning.
South Wales Police officers were called to Carlton Terrace in Swansea at about 03:10 BST.
The woman, aged 22, had been seriously assaulted and subsequently died.
Armed officers were deployed, along with the police helicopter, and a number of cordons were put in place while officers investigated.
Police said they were not looking for anyone else and asked for anyone who was in the area between 20:00 Monday and 04:00 Tuesday to come forward.