The fundraising page was set up to support the family financially and help the boy's recovery and rehabilitation.

It has raised more than £113,000 to date.

His parents said the money donated so far had supported them "financially to cover immediate costs such as our bills and mortgage", and to "cover our loss of wages during this time".

They said they had been able to buy new toys for the paediatric intensive care unit at Addenbrooke's Hospital in Cambridge and donate money to the Sick Children's Trust charity.

They said they also want to donate to the Addenbrooke's Charitable Trust (ACT) to thank staff who were involved in their son's care "including the supply of superhero costumes to brighten up his day".

They thanked everyone who had "shown such kindness and generosity during what has been a considerable ordeal for us all".

The BBC understands the arrested man, who did not know the child, has learning disabilities and was on a trip with carers.

He was released on bail until 18 September and police said he was "assessed as not being fit for interview".

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