Sri Lanka, Dec. 23 -- Greta Thunberg has been arrested at a demonstration in support of the Palestine Action protesters who are on hunger strike in prison, according to the Prisoners for Palestine protest group.

The 22-year-old activist was detained in the City of London after attending the scene of the early-morning demonstration on Fenchurch Street.

In a video shared by the group, she could be seen holding a sign reading "I support the Palestine Action prisoners" and "I oppose genocide".

City of London Police said a 22-year-old woman was arrested for displaying a placard in support of a proscribed organisation, in this case Palestine Action, contrary to Section 13 of the Terrorism Act 2000.

The force said officers were called to the...