A seven-tonne whale has made its way up the Thames to central London, where it is being watched by riverside crowds.
The 16-18ft (5m) northern bottle-nosed whale, which is usually found in deep sea waters, has been seen as far upstream as Chelsea.
A rescue boat has been sent to protect the whale and rescuers have been trying to keep it away from the river banks.
Specialist equipment, including inflatable tubes to re-direct the animal downstream, are being sent.
The whale has come within yards of the banks and has crashed into an empty boat causing slight bleeding. Vets are remaining on standby and experts have said it does not appear to be ill, but are concerned it will get weaker and may become beached.
Tony Woodley, of the British Divers Marine Life Rescue, which will be handling the rescue, said the animal's welfare was the main priority.
He said if attempts to re-direct the whale downstream failed, it may be necessary to put it down to prevent from suffering further.
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