Authorities say a 66-year-old Buddhist monk was critically injured when a fellow monk stabbed him in a San Francisco Bay Area home.

Oakland police tell Bay Area news station KPIX-TV (http://cbsloc.al/1dMgmak ) that no arrests have been made since the attack Tuesday. The victim is a monk at the Branch of International Community of Khmer Buddhist Monks Center, near where the assault happened.

Monk Chundoeun Phin says he heard the attack and rushed downstairs to find one monk slicing the other with two butcher knives. Phin told the station the assailant dropped the knives and ran away.

Phin says the attacker had only recently joined the monastery. He says he is in disbelief about the stabbing.

The names of the monks were not released.

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Information from: KPIX-TV.