Within moments , members of the crowd began pushing the officers and knocking their hats off their heads . Egypt : Three Egyptian officers forced to the square , witness protests . Numbers of demonstrators have swelled because the Muslim Brotherhood has joined . Groups are seeking prosecution of former president Hosni Mubarak . Egypt 's chief of police has been arrested .
Egypt : Three Egyptian officers forced to the square , witness protests . Numbers of demonstrators have swelled because the Muslim Brotherhood has joined . Groups are seeking prosecution of former president Hosni Mubarak . Egypt 's chief of police has been arrested .