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Cruel bullies dumped faeces, urine and spit on a 15-year-old boy with autism who thought he was taking part in the ALS Ice Bucket Challenge, his family have claimed.

Police and school authorities are investigating after footage emerged which allegedly shows the teenager standing in his pants in a driveway while a bucket of bodily fluids was thrown on him.

The 15-year-old, who has not been named, was reported to have been asked to take part in the challenge by a group of other young people.

His mother Diane said: “I want these kids held accountable for what they did to him and they targeted somebody who just didn’t really understand what was going on.”

The footage was discovered by the boy’s family on his mobile phone after those responsible uploaded it to the social media site Instagram.

Diane, of Bay Village, Ohio, said: “He was embarrassed because he did not know what the contents were until afterwards and then he didn’t want anybody to know.”

Jacob, the teenager’s brother, revealed his shock over finding the video and called for those responsible to be held to account.

He said: “I mean, the first thing that popped into my mind was like, why could someone – how could someone do this? How could someone really be this cruel to someone?”

Police confirmed they had been contacted about the footage and had launched an investigation while the school where the teenager goes said they were working hand-in-hand with officers.

A Bay High School spokesman said: “Obviously, if possible, we do want to hold those individuals accountable for their actions.”

The ALS Ice Bucket Challenge has been credited with raising more than £60 million for the ALS Association in America.

The charity supports people with Amyotrophic Lateral Sclerosis – known in the UK as motor neurone disease – and raises funds for research into the condition.