Surely the member would admit that we should not prejudge the inquiry and that there were some students or even non-students who were members of groups such as the International Socialist Workers Party and other radical organizations who were clearly there to disrupt the summit, posing a security threat and tearing down a security wall separating them from heads of states.
People tore down a security wall
( z1 tear-down :ARG0 ( z2 person ) :ARG1 ( z3 wall :mod ( z4 security ) ) )