A man in his 30s has died and seven other people have been injured after police were called to reports of someone with a knife in Cornwall.
Officers were called to the area of Victoria Square on Castle Canyke Road, Bodmin, at 3.15am on Sunday following a report that a number of people had been stabbed.
A 24-year-old man from Bodmin has been arrested on suspicion of murder, attempted murder and causing grievous bodily harm with intent.
He remains in police custody.
Detective Inspector Ilona Rosson, from Devon and Cornwall Police's major crime investigation team, said: "At this time we are treating this as an isolated matter and we are not seeking anyone else...
"This is a live and active police investigation, and I would urge people not to speculate on social media but if you have information which may assist us, please report it."
East Cornwall Local Policing Superintendent, Rob Youngman, added: "This investigation is in its early stages and the public can expect to see a heightened policing presence around Bodmin today whilst enquiries are ongoing."