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A Durham Regional Police shoulder patch at a Bowmanville, Ont. shopping centre parking lot, on Feb. 28, 2023.Doug Ives/The Canadian Press

Police in Durham Region say they have arrested a 13-year-old after a fatal attack on an elderly woman in Pickering, Ont.

Police had been searching for a suspect in what’s been described as a “sadistic,” unprovoked attack on the senior outside her home.

Police issued an emergency alert late Thursday afternoon asking area residents to shelter in place after the woman was stabbed.

The shelter-in-place warning has now been lifted.

Durham Regional Police Chief Peter Moreira said the woman was outside her home in the Fairport Road and Lynn Heights Drive area just after 3 p.m. when an apparent stranger approached and stabbed her.

The suspect fled on foot and was arrested several hours later.

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