A 3-year-old boy was critically injured after ending up in a crocodile enclosure at a family-run zoo in Huntingdon, England.

Police said the child was taken to the hospital and is in critical but stable condition.

A 30-year-old man, believed to be a stranger to the boy, has been arrested on suspicion of attempted murder.

Authorities are interviewing witnesses to determine how the incident occurred and have asked the public to avoid speculation while the investigation continues, ABC News has reported.

The zoo has closed its tropical house, which contains crocodiles and other reptiles, and expressed support for the boy and his family.