A heckler challenged the King about his brother Andrew Mountbatten-Windsor’s friendship with convicted paedophile Jeffrey Epstein as the monarch completed a high-street walkabout.
Shortly afterwards, a ITV News journalist asked Charles a question about his brother.
Charles and his wife Camilla walked through Dedham in Essex in the drizzle on Thursday flanked by crowds.
A man in the throng was heard to should "Charles, Charles, have you pressurised the police to start investigating Andrew?"
Police officers approached the man afterwards and walked with him away from the barriers, with Essex Police later confirming that no arrests had been made.
The King made no response to the call.
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