Beachgoers have been given a stark warning after a shark was spotted swimming off the British coast.
The blue shark was seen lurking in ankle-deep water at a popular beach in Falmouth, Cornwall.
Experts have urged people to stay away and say the sighting is a "real worry" with the species not usually venturing so close to the shore.
Harry Gooby, who filmed the shark, said the beast appeared to try and beach itself as it thrashed through the shallows.
"Silently, slowly and elegantly this blue shark just sort of swam by," he told BBC Radio Cornwall.
"Its snout came out of the water and onto the beach. It almost nuzzled underneath its neck on the beach."
Harry said he feared the shark was "in a bit of trouble but he was fantastic."
The eyewitness's concerns were quelled after speaking with a fisherman who did not think the fish was struggling.
However, experts say they are worried about the unusual sighting and fear that the shark could be hurt.
Dan Jarvis, of the British Divers Marine Life Rescue charity, advised people to ignore the sea creature and give it a wide berth.
"Our worry is that it is injured or unwell and might need some medical attention," he told the BBC.
"It could be disorientated and it's best for our team to monitor it, to give it the space and time to do what it wants.
"It could have just come for a look and will swim off when it's happy to.
"But if it's unwell, we don't want to cause it any more stress by people getting into the water and interfering with it."
Blue sharks can grow up to 13ft in length and are classified as a "dangerous species" known to attack humans and boats at sea.
They generally live in Mediterranean waters but can also be found along the British coastline.
The latest sighting comes just weeks after a snorkeller was bitten on the leg by a shark while swimming off the Cornish coast.
It is understood the woman had been on a blue shark sightseeing trip when she was attacked near Penzance.
Despite the ordeal, the brave water lover maintained it was "amazing to see such majestic creatures in the wild" and would not want the freak event to tarnish the species' reputation.
Several shark sightings have been reported along the south coast of England this year with Brits told to be vigilant.
Astonishing pictures emerged in April of what locals believed to be an unusual smooth-hound shark off the coast of Plymouth, Devon.
Rarely spotted in the UK, the sea creature was supposedly seen swimming in a marina just yards from a busy tourist area.
Separate photos show what some claim to be a great white shark captured from a beach in Goring, West Sussex in February.
Photographer James Venn, 42, told local media how he was feeding the birds when he saw something appear behind the waves.
Initially thinking it was a seal, he photographed the creature and later showed the snap to a fisherman who said it was "obviously a shark."
