A man is being questioned over the murder of his mother and the attempted murder of his brother.
The 52-year-old woman was killed, and her 31-year-old son was injured, after they were stabbed in Ballymena on Sunday.
Her 33-year-old son was arrested on suspicion of murder and attempted murder.
Police were called to the house at Rossburn Manor in the town at about 1230 BST.
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