Six women have evaded security guards at the 72-storey Shard in central London, to climb London's newest landmark to publicise the cause of global environmental group Greenpeace.
They said their climb was intended to put Shell and other oil companies in the spotlight.
Greenpeace said the protesters were "artists and activists", adding: "If the six women reach the top - 310m above the pavement (1,017ft) - they will attempt to hang a huge work of art that captures the beauty of the Arctic.
"They chose to climb the Shard because it towers over Shell's three London offices, including the oil giant's global headquarters on the South Bank of the Thames."
Greenpeace are known for their often daring and spectacular publicity stunts. The group seem to specialise in feats of climbing. Keep clicking to see some of their most memorable stunts.