Police in Amsterdam say they have detained dozens of people taking part in a pro-Palestinian demonstration countering a temporary ban on protests. Officials said hundreds of officers were on duty and had forced the demonstrators from the Dutch capital’s central Dam Square into the surrounding streets. Several dozen people had come to the Dam Square with Palestinian flags despite a protest ban. The city had earlier issued a ban on demonstrations in response to widespread acts of violence surrounding the presence of Israeli football fans on Thursday evening. Police said that both before and afte…