A man has been arrested on suspicion of attempted murder after a three-year-old boy was left with critical injuries after ending up in a zoo's crocodile enclosure.
Cambridgeshire Police said it was called to Johnsons of Old Hurst, near Huntingdon, at 13:24 BST.
The boy was taken to Addenbrooke's Hospital with serious injuries and is in a critical but stable condition, the force said.
A 30-year-old man from Norfolk has been arrested on suspicion of attempted murder and officers added that they do not believe the man and child were known to each other.
The force said it was investigating whether the child was attacked by the animals.
A spokesperson for Johnsons of Old Hurst said its thoughts and prayers were with the boy and his family.
"Out of respect to the family, our Tropical House will remain closed until further notice," they added.
"If you have any questions about the incident, please direct inquiries to Cambridgeshire Police Constabulary.
"The rest of the site will remain open as normal."