UK police have arrested a man on suspicion of attempted murder after a three-year-old boy was found in a crocodile enclosure, the UK police press service said Thursday.

Officers were called to the zoo at 1:24 p.m. following reports of a three-year-old boy being thrown into a crocodile enclosure, a statement on the UK police website said.

The boy was taken to hospital with serious injuries and is in a critical but stable condition.

Police said a 30-year-old man from Norfolk has been arrested on suspicion of attempted murder. It is believed he did not know the boy.