(LONDON) -- The man arrested and charged after a 3-year-old boy wound up in a crocodile enclosure at a British zoo was released on bail Friday as the investigation continues, police said.

The unidentified 30-year-old suspect from Norfolk was released after investigators said he "was assessed as unfit for police interview," according to the Cambridgeshire Constabulary.

The incident occurred on Thursday afternoon at Johnsons of Old Hurst, a family-run farm and zoo located in Huntingdon in Cambridgeshire, when the unidentified boy "ended up in the crocodile enclosure," police said.

The boy sustained "serious injuries" while in the enclosure and was pulled out by staff from the zoo. He received medical treatment at the scene before being taken to the hospital, according to the police.

He was listed in critical but stable condition as of Friday. The suspect, who will remain on bail until September, is not known to the victim, according to police.

The suspect was arrested under suspicion of attempted murder.

Johnsons of Old Hurst said its tropical house, which is home to multiple species of crocodiles and other reptiles, will remain closed until further notice "out of respect to the family."

"Our thoughts and prayers are with the boy and his family following the incident that occurred today," Johnsons of Old Hurst said in a statement on social media Thursday. 

-ABC News' Meredith Deliso contributed to this report.

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