LONDON - Police say a British man who was arrested at an air base used by the U.S. Air Force in England has been detained for involuntary treatment under the Mental Health Act.

That means authorities believe he needs urgent treatment for a mental health problem and poses a risk to himself and others.

Suspect in UK Air Base Incident Kept on Psychiatric Hold

The 44-year-old man has not been charged in connection with an incident Monday that prompted a lockdown at the RAF Mildenhall base.

Suspect in UK Air Base Incident Kept on Psychiatric Hold

He was arrested on suspicion of criminal trespass after trying to enter the base. Police say the incident was not connected to terrorism.

Suspect in UK Air Base Incident Kept on Psychiatric Hold

Officials say American service personnel fired shots as it unfolded. The man suffered cuts and bruises, but no one else was hurt.

The military and police didn't identify or provide further details on Tuesday.