An artist was stopped outside Buckingham Gate in central London by police officers on Wednesday afternoon because they believed the artwork he was carrying was a rifle.
Artist Ray Fiasco said he had simply been walking through the area carrying his artwork.
The police told BuzzFeed News they had received a report of someone holding a "suspicious-looking package".
Fiasco said the armed police pointed guns at him and searched his belongings.
The police have denied Fiasco's claims that he was searched or that they pointed their weapons at him.
In a statement provided to BuzzFeed News, the Metropolitan police said that at no stage did officers point their weapons at Fiasco.
The Met stated that he was spoken to by officers, but that he was not searched or arrested.