Six women protesters from Greenpeace International have evaded security at London's Shard skyscraper and are attempting to climb to the top.
Another early morning start , the six activists, who are from the UK, Canada, Sweden, Poland, Holland and Belgium, began to ascend the 72-storey building.
A statement from Greenpeace said the action was part of their campaign against oil and gas drilling in the Arctic and that the activists carried out a safety assessment beforehand.
The women were able to access the Shard from the roof of nearby London Bridge station, after months of planning and training.
The campaigners said they chose the Shard because of its proximity to oil company Shell's three London offices.
"Shell is leading oil companies' drive into the Arctic, investing billions in its Alaskan and Russian drilling programmes," Greenpeace said in a statement.
The lead climbers are understood to be 'free climbing' (scaling the building without assistance) but are fixing safety ropes as they make their way to the summit.
Greenpeace are streaming live video of the attempt from a camera worn by one of the climbers.
A statement on our Greenpeace UK Twitter account says: "Look up London. We're attempting to scale the Shard, Europe's tallest skyscraper."
The women are understood to be planning to unveil protest artwork "that captures the beauty of the Arctic" if they manage to reach the summit, which could take them all day.
One of the climbers is Victoria Henry, 32, a Canadian living in London.
"We'll try to hang a huge art installation 310m up that will make Shell think twice before sending their rigs into the Arctic," she said.
"It's going to be really hard work, it's going to be nerve-shredding for all of us and we may not succeed, but we're going to do everything we can to pull it off."
A spokesman for the Metropolitan Police said: "We were called at 4.20am today to a group of protesters attempting to climb up the Shard. We are in attendance and monitoring the situation along with British Transport Police."
A Shard spokesman said: "The Shard continues to work with the emergency services and we are in constant discussion with the Greenpeace representatives to ensure the safety of the protestors.
"We have asked them to stop climbing and come back into the building as what they are doing is dangerous. We take security, health and safety of all our occupiers and visitors to the building extremely seriously.
"The protestors have gained access in the early hours of the morning through an adjacent building and what they are doing is extremely dangerous."
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