A fourth arrest's been made by police over the shooting of a senior detective in County Tyrone.
John Caldwell was targeted at a sports centre in Omagh where he'd been coaching children on Wednesday night.
The police officer is still in a critical condition after being shot a number of times in front of his young son.
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Dissident republican group, the New IRA, is the "primary focus" of the investigation. Tony Blair, the British prime minister who co-brokered the Good Friday agreement, is calling for strong leadership.
