Pro-Palestine marches in London and Manchester are set to go ahead despite the prime minister and police bosses calling for organisers to reconsider after two people were killed in a terror attack at a synagogue in Manchester. But a demonstration in central London against the proscription of Palestine Action will go ahead on Saturday, with the organisers, Defend Our Juries, saying: "Cancelling peaceful protests lets terror win." A similar event held by Greater Manchester Friends of Palestine is also set to take place. Read more:Families pay tribute to 'kind and heroic' synagogue attack victimsManchester attacker's relatives condemn 'heinous act'Image: Police officers and demonstrators at a protest in Parliament Square in London. They added: "Cancelling peaceful protests lets terror win.