Officers are working with counter-terrorism policing on the attack that saw three killed.
Chief Constable Kate Meynell said: "This is a tragic series of events which has led to the lives of three innocent people being taken and left another member of the public in a critical condition in hospital.
"We are at the early stages of the investigation and need to determine the motives behind these attacks and will keep the public updated as soon as we are able to say more. "We do have a man in custody who has been arrested on suspicion of murder. Currently, we do not believe there is anyone else involved in this incident."Warning: People may find some of the details in the story upsettingOne said he saw a young man and young woman being stabbed in Ilkeston Road, close to the junction with Bright Street, at about 04:00.
"I saw him stab the lad first and then the woman. It was repeated stabbing - four or five times. The lad collapsed in the middle of the road.
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