Three men are 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 but say exact details of what happen remain unclear.
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The Independent Office for Police Conduct (IOPC) said it was investigating Essex Police's handling of the investigation.
Campbell has been reportedly recommended to Ipswich’s board and is expected to hold talks over the job in the next few weeks.
Rain will quickly spread to all parts, becoming heavy at times.