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.
A barrier was torn down at the summit.
( z1 tear-down :ARG1 ( z2 barrier ) :location ( z3 summit ) )