One person was killed and four others injured when a man armed with a knife attacked clergy and worshippers at a Catholic monastery in southern Poland.

Police said the 31-year-old attacker, a Ukrainian national, went on a stabbing spree at the 17th-century Benedictine abbey in Jaroslaw, some 30km (19 miles) from the border with Ukraine, on Thursday morning.

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The suspect, who had entered Poland from Germany earlier in the day, reportedly grabbed a knife from the abbey’s kitchen and attacked four men and one woman, including a priest in a confessional, police said.

“Three of the victims are clergy members and two are laypeople; one person has died,” said prosecutor Bozena Harasz-Wołoszyn. Two others were in “critical, life-threatening condition”.

Polish media identified the man who died as a priest. Police did not immediately confirm the identity of the deceased.

Prosecutors said the attacker was headed for a nearby border crossing back into Ukraine but instead went to the abbey.

The motive remains unclear, and doctors will assess whether he was under the influence of alcohol, Harasz-Wołoszyn said.

Polish Prime Minister Donald Tusk said the “murderer” would be “punished with the full severity of Polish law”.

Ukrainian President Volodymyr Zelenskyy called the attack a “horrific crime”.

“The perpetrator of this evil must bear full responsibility in accordance with the law … We are shaken by this evil. Justice must be done.”