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Authorities hunting the killer of a police officer in Northern Ireland last week say they have seized a gun and ammunition.

They were found Saturday in Craigavon, the town where Stephen Carroll, 48, was shot dead on Monday, a police statement said Sunday.

Authorities also arrested two more people in connection with the killing of Carroll -- a 37-year-old man and a 30-year-old woman. That brings the total in custody to five, police told CNN. Read full article »

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