Greta Thunberg Arrested in London Under UK Terrorism Law at Pro-Palestinian Protest. Swedish climate activist Greta Thunberg was arrested in London during a pro-Palestinian protest and later released on bail, police said. UK campaign group Prisoners for Palestine said Thunberg was arrested under the Terrorism Act after holding a placard supporting prisoners linked to Palestine Action which the British government has designated a terrorist organisation. The sign Thunberg displayed read: “I support the Palestine Action prisoners. I oppose genocide,” according to the group. The City of London Police said Thunberg had been bailed until March after her arrest. Police said two other individuals were arrested for throwing red paint at a building, while Thunberg was detained for displaying a placard in support of a proscribed organisation. Prisoners for Palestine said the protest targeted a building used by an insurer it claimed provided services to the UK arm of Israeli defence firm Elbit Systems. Thunberg rose to global prominence after launching school climate strikes in 2018 and has increasingly taken part in wider protest movements beyond climate activism. Last year, she was cleared of a public order offence in the UK and was later detained and expelled by Israel after joining a Gaza-bound aid flotilla.