A march for a cause is happening in a city area.
The police are making sure the march stays peaceful.
Just because the police are present does not imply they are securing the march.
exists e1 x1 x2 x3 x4.(in(e1,x3) & n_area(x3) & of(x3,x4) & n_city(x4) & Actor(e1,x1) & v_happen(e1) & for(x1,x2) & n_cause(x2) & n_march(x1))
exists e1 p1 x1 x2.(n_march(x2) & n_police(x1) & exists e2 p2.(exists e3 p3.(exists s1.(Theme(s1,x2) & a_peaceful(s1)) & Topic(e3,p3) & Actor(e3,x2) & v_stay(e3)) & Topic(e2,p2) & Actor(e2,x1) & v_sure(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_make(e1))