3,000 arrested after London protest becomes unruly ; officer knocked out . Three people were arrested . Police say 20,000 gathered outside the Hay-Adams Hotel in London . Similar demonstrations take place in other pro-Palestinian cities . 3,000 protest outside temporary residence of London President-elect Europe .
3,000 arrested after London protest becomes unruly ; officer knocked out . Police say 20,000 gathered outside the Hay-Adams Hotel in London . Similar demonstrations take place in other pro-Palestinian cities . 3,000 protest outside temporary residence of London President-elect Europe .