Climate activist Greta Thunberg detained by UK police

Video footage showed Thunberg, wearing a badge with the slogan "Oily Money Out" standing calmly as two police officers spoke to her.

One was seen holding her arm.

London's Metropolitan Police did not immediately provide a statement when contacted by Reuters.

Environmental group Greenpeace said two of its activists scaled the Intercontinental Hotel in Mayfair and unfurled a giant banner over its entrance reading "Make Big Oil Pay" in protest at a gathering of oil and gas leaders taking place inside the building, including Shell CEO Wael Sawan.

The group said hundreds of demonstrators had gathered in front of the venue to protest against the influence of the fossil fuel industry on United Kingdom and global climate politics, blocking entrances and preventing delegates from entering.