The man was arrested after he allegedly assaulted two people in a hangar and verbally threatened a third person at 02:30 BST on Tuesday. He was arrested on suspicion of assault, but was declared unfit for police interview after a mental health assessment. The man has been returned to HMP Norwich.
Norfolk Police said: "This is not being treated as a terror-related incident and police are not looking for anyone else in connection with it."Police said a man entered a secure area hangar, approached two male workers, assaulted one with a mug and another with what is believed to be a shard of broken glass. The men suffered minor cuts and bruises.
The suspect then made towards a parked up lorry and climbed into the cab before verbally threatening a security staff member who was working nearby.
Armed Police officers arrived and detained the man, at no time was the vehicle moved or driven by the suspect, police confirmed.
The incident took place in a secure area not normally open to the public and as a consequence did not affect any public areas and the airport remained open with flights operating as normal.
Detectives are keen to speak to any witnesses or anyone who saw a man acting suspiciously in the area at the time.
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