The victim had just left Dungannon police station, Co Tyrone, in November 2007 after finishing work and was stopped outside a church when a gunman fired the rounds and seriously injured him.
The officer drove back to the station, where he crashed into the front gates, and received medical help from colleagues before being taken to hospital.
Three suspects, aged 36, 37 and 41, were detained in Co Antrim and taken to Antrim police station for questioning.
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