Officers were called to the Tees Street area of Hartlepool (Picture: Google Maps)
Counter-terrorism police are investigating after a man was killed and another was injured.
The incident happened in the Tees Street area of Hartlepool in the early hours of Sunday morning.
Cleveland Police says it is working with Counter Terrorism Policing North East to investigate.
A 44-year-old man has been arrested on suspicion of murder and attempted murder.
A spokesman for the force says there is not believed to be any ongoing threat to the public, adding: ‘Cleveland Police are investigating the death of a man and the assault of another in the early hours of Sunday in the Tees Street area of Hartlepool.
‘A 44-year-old man has been arrested on suspicion of murder and attempted murder and remains in custody.
‘Due to initial inquiries into the circumstances of the incident, Cleveland Police are working with Counter Terrorism Policing North East on the investigation.
‘Counter Terrorism Policing has deployed its specialist capabilities to help establish what happened.
‘It is not believed that there is any outstanding threat to the public and the local community connected to this incident.
‘A cordon remains in place and a search is ongoing at a property in the area.
‘The man who was assaulted was taken to hospital and remains there with what are believed to be non-life threatening injuries.’
The incident happened in the Tees Street area of Hartlepool in the early hours of Sunday morning.