Dozens of people have been arrested at a pro-Palestine demonstration in Amsterdam, the police said on Monday. The demonstrators reportedly did not follow the authorities’ guidelines, leading to the demonstration being called off. They had attempted to reach the central Dam Square in the Dutch capital, where a memorial rally for the victims of the Hamas massacre was taking place at the same time. Consequently, the police intervened with mobile units, horses and dogs. At several train stations across the country, hundreds of people also staged sit-in protests for Palestinian rights. These gather…