Open this photo in gallery: Protester hold flags and placards as they take part in a pro-Palestinian demonstration as pass by Trafalgar Square in London, Nov. 25, 2023.Alberto Pezzali/The Associated Press A protester was arrested Saturday in London on suspicion of inciting racial hatred, as tens of thousands of people turned out on central London’s streets for a pro-Palestinian march calling for a permanent cease-fire in Gaza. The National March for Palestine, which aimed to finish in Whitehall, central London, was the latest in several huge protests that have dominated the British capital’s streets every weekend since the Israel-Hamas war...