A police spokesman has said that the rocket launcher and warhead found in Belfast were intended to be used to kill.
Officers found the weapons while searching a house in Hawthorn Street in West Belfast.
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Police believe a tree currently growing near the farmhouse where the 21-month-old toddler was last seen in 1991 was not there at the time.
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Michael and Paula McCann and their two young children returned from holiday to find their terraced house in Belfast infested by rodents.