London police on Tuesday arrested Swedish activist Greta Thunberg at a demonstration in support of pro-Palestinian hunger strikers, Palestinian campaign groups said.

Thunberg's arrest makes her the highest profile person to be detained by police since the government banned the Palestine Action group under anti-terror laws.

Prisoners for Palestine, which organised the protest, said in a statement that Thunberg was arrested under the UK Terrorism Act.

Thunberg, 22, was holding a sign reading: "I support the Palestine Action prisoners. I oppose genocide."

City of London Police said several people were arrested.

They did not directly name Thunberg, but said "a 22-year-old woman... has been arrested for displaying an item (in this case........

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