Dec. 23 (UPI) -- London police arrested Swedish activist Greta Thunberg on Tuesday for holding a protest sign supporting Palestine Action hunger strikers.

Thunberg, 22, joined the protest outside an insurance company office in London. She allegedly sat with a handwritten sign that said, "I support the Palestine Action prisoners. I oppose genocide."

Palestine Action, a Britain-based protest group, was named a terrorist organization by the British government in July. The group broke into Britain's largest air force base in June and damaged two planes in protest against the country's support of Israel. Since then, hundreds of protesters have been arrested during demonstrations.

Thunberg said in a statement: "It is up to the state to intervene and put an end to this by meeting these reasonable demands that pave the way for the freedom of all those who choose to use their rights trying to stop a genocide, something the British state has failed to do themselves."

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