British police arrested Swedish activist Greta Thunberg in London on Tuesday at a pro-Palestinian protest, UK-based campaign group Prisoners for Palestine said.
It said Thunberg was arrested under the Terrorism Act for holding a sign that said "I support the Palestine Action prisoners. I oppose genocide". The British government has proscribed Palestine Action as a terrorist group.
A City of London spokesperson said two other people had been arrested for throwing red paint at a building.
The spokesperson said a 22-year-old woman later attended the scene and was arrested for displaying a placard in support of a proscribed organisation.
Swedish activist Greta Thunberg was released from custody after being arrested on Tuesday in London at a pro-Palestinian protest, police said.
UK-based campaign group Prisoners for Palestine said Thunberg was earlier arrested under the Terrorism Act for holding a sign that said "I support the Palestine Action prisoners. I oppose genocide". The British government has proscribed Palestine Action as a terrorist group.
City of London Police said Thunberg had been bailed until March.
Prisoners for Palestine, which supports some detained activists who have gone on hunger strike, said the building had been targeted because it was used by an insurance firm which they said provided services to the British arm of Israeli defence firm Elbit Systems.
The insurance company did not immediately respond to a request for comment.
Thunberg, 22, became prominent after staging weekly climate protests in front of the Swedish parliament in 2018.
Last year, she was cleared of a public order offence in Britain as a judge ruled police had no power to arrest her and others at a protest in London the year before.
She was detained along with 478 people and expelled by Israel in October after joining an activist convoy of vessels, the Global Sumud Flotilla, that attempted to reach Gaza with aid supplies. Israel has consistently denied genocide allegations.
The protest came amid rising criticism against the government over the state of six detainees linked to the banned group Palestine Action, who are on a hunger strike since November.
Palestine Action was banned in July under the UK's 2000 Terrorism Act after members of the group entered Royal Air Force Brize Norton base, damaging two aircraft. Hundreds of pro-Palestine activists have since been arrested across the UK.
