A 'shark' was reportedly spotted by shocked onlookers in the River Thames in central London yesterday.
The 'sighting' comes just one day after a man claimed to have seen another mysterious fin gliding above the waters in west London.
John Hucknall, 23, who was on his way to work at the time, told The Sun : “My mate and I were running Hammersmith way by the river. As we were running we saw this thing sticking out of the water.
"I’m not David Attenborough but I’m thinking that’s a big old shark. We took the photo and finished the run and kept looking back at it and thought there’s something there.
“If there is something going up and down the Thames it’s a good time for it as there’s hardly anything in there."
Eyewitness Yasmin Dan, tweeted: "Walked through central today and looked in the river.. is that a shark in the Thames??!"
One Twitter user responded: "Wow you can clearly see its fin #riverthamesshark."
While social media user Adam Barnett, tweeted: "Err! Is that what I think it is, a shark in the Thames.'
A spokesperson for the Port of London authority was unable to confirm what the object was but said was unlikely to be a shark.
In a statement, they said: "The photos we have seen are not very clear.
"The dark object could well be a piece of debris or driftwood.
"None of our teams have reported an animal in the river today.
"However we cannot give a definitive view either way from that photo. If anyone spots anything similar do please let us know!
"A shark is however very unlikely – though species like the dog fish and smooth hound have been seen further out in the Thames Estuary.
"However, if it is the dorsal fin of an animal, it is more likely to be that of a small cetacean such as a harbour porpoise.
"These are not uncommon in the Thames and have been spotted in central London on many occasions."
A swimmer was spotted swimming within inches of a huge 20ft shark in nail-biting footage video filmed off the coast of Malaga.
The video shows the man bobbing about in the water close to the shark as it swims within a few inches of him.
The shark then swims past him, prompting him to dip below the water to get a better look before it swims off.
