A police force donned in full gear are crossing the street.
They are responding to an emergency call.
A police force does not necessarily have to be responding to an emergency call.
exists e1 e2 s1 x1 x2 x3 x4 x5.(n_street(x5) & Theme(e2,x5) & Actor(e2,x1) & v_cross(e2) & in(e1,x4) & n_gear(x4) & a_full(s1) & Theme(s1,x4) & Theme(e1,x3) & v_don(e1) & (x1 = x3) & n_force(x1) & of(x1,x2) & n_police(x2))
exists e1 x1 x2.(to(e1,x1) & n_call(x1) & of(x1,x2) & n_emergency(x2) & Actor(e1,x1) & v_respond(e1) & n_thing(x1))