Hundreds of people are gathered as attempts are made to free a stranded whale on the River Thames.
It is currently trapped on the river bed under a small bridge and marine experts, along with the RSPCA, are trying to figure out their next move.
The tide is continuing to rise so there is hope that might free the whale.
The three-metre injured minke calf was seen swimming upstream just hours after it was refloated last night.
A photographer spotted the whale in Teddington several miles upstream from where it was set on course back towards the sea by a team of rescuers.
These include personnel from the Port of London Authority, Royal National Lifeboat Institute (RNLI), British Divers Marine Life Rescue, London Fire Brigade and the police.
But as the baby whale began heading in the wrong direction – away from the sea – there were growing fears about its fate.
It is hundreds of miles from its natural habitat in the wilds of the north Atlantic.
An RNLI worker on the scene told the Mirror the whale is in danger in its current position, with shrapnel and sharp items around the riverbed.
“He’s run out of river to be honest – he has got nowhere to go unless he turns back and swims the right way,” said Martin Garside, a spokesman from Port of London Authority.
The stranded whale was first spotted on Sunday night at Richmond Lock. Rescuers worked for hours to refloat it and then towed it a mile downstream.
“That whale’s life hangs in the balance: it is injured, it is very young and it is so far from home,” said Garside.
“This animal comes from the northern North Sea – so it is hundreds of miles where it should be. The whale is a hundred miles from the opening to the North Sea in the Thames Estuary,” he said.
“There is no obvious sign of his mother.”
The common minke whale is the smallest of all baleen whales, reaching 8-9 metres (26-30 feet) long.
The whales prefer cooler temperatures and enjoy a varied diet of krill and schooling fish, according to the Whale and Dolphin Conservation group.
They do not usually appear in the River Thames and it was not immediately clear why the minke calf was so far from its normal feeding grounds.
“This whale could have become lost whilst following prey, or could be ill or injured,” Danny Groves of Whale and Dolphin Conservation said.
“Equally, many whales and dolphins get into difficulty because they may have been struck by a vessel at sea, injured in fishing nets, driven off course by loud underwater noise from seismic surveys for oil or gas, or loud underwater sonar from military exercises.
“This poor individual is way off course and still faces a struggle to get back out to sea,” Groves said.
Richard Courtney, 68, from Hampton Wick, came down after hearing the animal was trapped.
“We’re all gunning for him to get free,” he told the Mirror. “That’s as full as that bridge has been for a long time.”
Another onlooker added: “He needs human help. If he does not get it soon he won’t survive. It’s just a baby.”