Police officers holding back a group of people on the other side.
Police officers prevent people from passing.
Police officers are holding people back to stop them from passing.
exists e1 s1 x1 x2 x3 x4 x5 x6.(-(x6 = x6) & n_side(x6) & a_topic(x1) & on(e1,x6) & a_back(s1) & Manner(e1,s1) & Theme(e1,x4) & Actor(e1,x3) & v_hold(e1) & of(x4,x5) & n_people(x5) & n_group(x4) & (x1 = x3) & n_officer(x1) & of(x1,x2) & n_police(x2))
exists e2 e1 x1 x2 x3 x4.(from(e1,e2) & Actor(e2,x4) & v_pass(e2) & Theme(e1,x3) & Actor(e1,x1) & v_prevent(e1) & n_people(x3) & n_officer(x1) & of(x1,x2) & n_police(x2))