British authorities are asking for witnesses to a possible neglect incident at a Legoland theme park to come forward after a disturbing incident.

A 27-year-old woman was arrested after a five-month-old boy suffered a cardiac arrest at the Legoland Windsor Resort a child-friendly park based on lego building blocks.

It happened at the Coastguard HQ boat ride around 1 p.m. last Thursday.

The Thames Valley Police say the boy was taken to hospital, where he remained in a critical condition.

The woman, who was not named, was arrested on suspicion of neglecting a child to cause unnecessary injury. She has been released on police bail until a July 26 hearing.

"We are investigating a distressing incident involving a very young child at Legoland Windsor," Investigating officer Detective Constable Zoe Eele, of the Child Abuse Investigation Unit said.

Police did not release any information about what happened or why they suspect it is a child neglect case.

"Firstly, our thoughts are with the family of the boy who is in a critical condition in hospital after suffering a cardiac arrest. We are supporting them as best we can at this extremely difficult time," Eele said.

Police say they are not looking for anyone else as a suspect in the case.

"I would ask for the public to please avoid speculation about the incident and to respect the boy's family at this deeply upsetting time," Eele said.

Legoland Windsor Resort is a popular tourist destination with 55 rides geared for children aged 2 to 12.

HNGN has reached out to Legoland for comment on the incident.