Reverend Claude Grou was celebrating mass at Montreal's landmark Saint Joseph's Oratory Friday, when a man in a baseball cap ran up to the alter.
He then rushed the priest who tried to run away.
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The 77-year-old priest was stabbed after the man tackled him.
People rushed to the 26-year-old attacker, bringing him down.
They held onto him until police arrived.
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According to the diocese, the priest's injuries were not severe.
So far, there's no word on why the priest was attacked.