On Tuesday, renowned climate activist Greta Thunberg was detained in London during a demonstration in support of pro-Palestinian activists who are currently on hunger strike in British prisons.

The protest group, known as Prisoners for Palestine, shared a video featuring the 22-year-old Swedish activist. In the footage, Thunberg is seen holding a placard that reads, “I support Palestine Action prisoners. I oppose genocide,” referencing the ongoing conflict in Gaza between Israel and Hamas.

According to a post by the group on social media platform X, Thunberg was subsequently released on bail.

The demonstration took place in front of the offices of Aspen Insurance in London, where Thunberg showed her solidarity with the prisoners involved in the hunger strike.

The protest aimed to back Palestine Action, a group currently banned in the UK due to its classification as a terrorist organization.

The protests were part of a larger demonstration in which two other activists sprayed red paint in front of an insurance company in London.

Prisoners for Palestine says they targeted the insurer because it supports the Israel-linked defense firm Elbit Systems.

Greta Thunberg and activists from the Global Sumud Flotilla hold a press conference in central Stockholm, Sweden, Oct. 7, 2025. (TT News Agency/Caisa Rasmussen via Reuters)

A man and a woman have been arrested on suspicion of criminal damage. A third woman was later arrested on suspicion of supporting a banned organization. 

Eight Palestine Action members have staged a hunger strike to protest their detention without bail. They are awaiting trial on charges related to earlier protests. 

Two of the members have been on hunger strike for 52 days and are at a “critical stage, where death is a real possibility,” Prisoners for Palestine said in a statement.

Greta Thunberg and other activists meet with journalists in Catania, Italy, ahead of their departure for the Mideast. (AP)

Last year, Thunberg was acquitted by a London court of refusing to follow a police order to leave a protest that was blocking the entrance to an oil and gas industry conference.