People attend a protest against U.S.-Israeli attacks on Iran in central London, Britain, March 21, 2026. (Xinhua/Li Ying)

Placards are pictured in front of Trafalgar Square during a protest against U.S.-Israeli attacks on Iran in central London, Britain, March 21, 2026. (Xinhua/Li Ying)

A man attends a protest against U.S.-Israeli attacks on Iran in central London, Britain, March 21, 2026. (Xinhua/Li Ying)

People hold placards in front of Trafalgar Square during a protest against U.S.-Israeli attacks on Iran in central London, Britain, March 21, 2026. (Xinhua/Li Ying)

A man attends a protest against U.S.-Israeli attacks on Iran in central London, Britain, March 21, 2026. (Xinhua/Li Ying)