A man has been arrested on suspicion of murder after another man died and a woman was taken to hospital.
Police were called at about 2.50am to reports of a woman being stabbed at a property in Saturn Road, Ipswich.
They discovered a man with stab wounds and he was taken to Ipswich Hospital where he was declared dead.
A woman was found at the scene with leg injuries and was taken to the same hospital.
A Suffolk Police spokesman said: "A 37-year-old man from Ipswich was arrested on scene by officers and has been taken to the Martlesham Police Investigation Centre where he currently remains.
"A scene has been put in place and police remain at the property."
Anyone with information about the incident is asked to contact Suffolk Police on 101.