'American Airlines has been accused of discrimination after one family claims they were not allowed to board a flight due to their son’s medical condition.

On Sunday, the Vanderhorst family arrived at Newark Liberty International Airport in New Jersey where they tried to board an American Airlines flight to Los Angeles. Their trip was brought to an abrupt halt after the pilot declared their son a “security threat.”

Joan and Robert Vanderhorst’s 16-year-old son Bede has Down’s Syndrome, a disease categorized by a severe degree of intellectual disability. According to American Airlines, the boy posed a “safety” risk to himself and others because he was “excitable and running around.”'

Read more: American Airlines Disallows Boarding of 16-year-old with Down Syndrome