NEW : Police pen student demonstrators in for hours , a protester says . A crowd of students marched through central London on Wednesday , disrupting traffic and shouting slogans in a protest against an increase in university tuition . Students are angry about government plans to allow tuition increases . Score: 6 Other protests are reported in Leeds , Cambridge and Birmingham .
NEW : Police pen student demonstrators in for hours , a protester says . Students are angry about government plans to allow tuition increases . Score: 6 Other protests are reported in Leeds , Cambridge and Birmingham .