Beyond the occasional shriek from a pointing child, the crocodile enclosure at Johnsons Zoo is normally a place of calm.

The "distressing incident" occurred Thursday afternoon at Johnsons of Old Hurst, a family-run farm and zoo located in Huntingdon in Cambridgeshire, police said.

A routine family visit to a popular Cambridgeshire zoo turned into a nightmare when a three-year-old boy was found critically injured inside a crocodile enclosure, triggering a…