Woman and girls in knife incident
A 23-year-old woman and two girls aged three and six are in hospital after suffering "knife wounds", police said.
The woman and the three-year-old girl were both "critical but stable" following the incident in Norwich, Norfolk, said a spokeswoman - while the six-year-old girl was "stable".
Police said a 28-year-old man had been arrested in Great Yarmouth, Norfolk.
Detectives said the victims and the arrested man were "known to each other".
Police and scenes of crime officers were tonight at a flat in Mill Close near Norwich city centre.
Neighbour Gillian Dean, 66, said the woman was the children's mother.
Miss Dean said: "It was between 11 and 11.30 this morning. I heard screaming and banging and noise.
"I didn't really take too much notice. There's often noise. Then I saw the police car and saw something was up and saw the ambulances. They took them away in three ambulances. It looked pretty bad."
Police said the injured woman and the children were being treated at Norfolk and Norwich University Hospital in Norwich.
Detective Chief Inspector Rickie Botwright added: "This appears to be an isolated incident involving people known to one another. We are currently trying to establish the exact details."