Police in the UK have arrested a man on suspicion of attempted murder after a 3-year-old boy was found in a critical condition inside a zoo’s crocodile enclosure.

“Officers were called to the zoo at 1.24pm to reports of an incident involving a three-year-old boy, during which he ended up in the crocodile enclosure,” Cambridgeshire police said.

The child has been taken to the hospital with serious injuries and is in critical but stable condition, police said, adding that specially trained officers are supporting the boy and his family.

A 30-year-old man from Norfolk was arrested and police say they do not believe he and the child are known to each other and an investigation is underway.

“At this stage we are speaking to people who were at the zoo at the time of this distressing incident to understand more about the circumstances,” said Detective Inspector Verity McCann.