(The Local) A gorilla opened a gash in a woman’s forehead after throwing rocks at her at a Swedish zoo on Saturday.

The woman, 38, was hit in the forehead by the stone, which was thrown by one of the five gorillas at the Kolmården National Park in central Sweden. The stone measured roughly five centimetres in diameter, said Marjorie Castro, head of the zoo.

“At first everything seemed fine. She was bleeding a little from her forehead, but seemed to be in good health,” Castro told the Aftonbladet paper. “But she was hit in the head and gorillas have enormous strength, so we called an ambulance.

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