Police say they arrested a man on suspicion of assault, shortly after an alleged attack in a taxi office in Weston-super-Mare on June 16th.
The 24 year old has been released on bail pending further enquiries.
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Mark Ormrod who served with Taunton-based 40 Commando was selected from more than 300 as one of 90 to take part in the games.
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Police officers should not physically restrain people with known or suspected mental health problems, the official watchdog has said.