A Cleveland Police spokeswoman said the 22-year-old man arrested in connection with the incident has been released on bail.
The injured man remains in an induced coma in hospital, police confirmed.
Officers say they have been searching for all evidence from the scene. It is unclear whether they have found the missing penis.
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The twin brother of the police officer shot and blinded by gunman Raoul Moat says his family are still waiting for justice five years later.
One of the world's biggest ever birthday parties is being held in the North East this weekend.
The National Trust invites everyone to celebrate the great British coast with their Big Beach Picnic, with three events in the North East.