A shark is rumoured to be swimming in the River Thames.
Shark
Separate sightings of what appears to be a fin have been spotted in the water in recent days, sparking fear that a man-eating shark could be swimming in London.
John Hucknall was jogging with a friend when he spotted the fin near Hammersmith.
He told The Sun newspaper: ''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.''
The Port of London Authority has eased concern by suggesting that it is more likely to be a piece of debris.
They said: ''The dark object could well be a piece of debris, a shark however is very unlikely.''