Greta Thunberg has removed from protests in Sweden, Norway and Germany. (File).
Climate activist Greta Thunberg was detained by police in London on Tuesday, a Reuters witness reported, after she addressed protesters at a demonstration against oil and gas companies in the centre of the city.
Greta Thunberg, who became the face of young climate activists worldwide after staging weekly protests in front of the Swedish parliament in 2018, has this year been detained by police or removed from protests in Sweden, Norway and Germany.
Video footage showed Ms 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 UK and global climate politics, blocking entrances and preventing delegates from entering.
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