Three men remain in hospital in Peterborough after being shot on a travellers' site on the outskirts of the city.
Two were in a critical condition and the third was described as "stable".
Armed police were called to the Oxney Road site at 10am yesterday but say exact details of what happened remain unclear.
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The 46-year-old was arrested on suspicion of membership of a proscribed organisation and malicious communications.
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