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Porpoises in the Thames
A pod of porpoises has swum up the River Thames to central London, say the Metropolitan Police Marine Policing Unit.
Live updates
Porpoise sightings could be related to tidal surge
First porpoise picture
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Porpoises seen in the Thames in 2004
Porpoises pictured swimming in the Thames by Vauxhall Bridge in December 2004.
The mammals have been sited over the years but there are no official records of them being found in the Thames.
River workers hope for porpoise pics
Porpoises last seen in Battersea
Send us your porpoise pics!
Have you seen the porpoises in the Thames? Tweet us your sightings to @itvlondon!
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Porpoises in Lambeth area
Porpoises sighted near Tower Bridge
A pod of porpoises has swum up the River Thames to central London.
The Metropolitan Police Marine Policing Unit, which is following the group of mammals, tweeted that they "seem happy enough".
Initially the river patrol team, which tweets as @MPSonthewater, reported a sighting of a dolphin at Tower Bridge.
But further updates revealed the creatures to be harbour porpoises, which usually stick to coastal areas and river estuaries, but are known to venture further upstream.
(Image shows a porpoise in the River Bann in Northern Ireland)