The men are talking to the person in the police van.
There is a criminal in the back of a police van.
Just because a person in the police van it does not mean they are a criminal.
exists e1 x1 x2 x3 x4.(n_van(x3) & of(x3,x4) & n_police(x4) & n_person(x2) & n_man(x1) & to(e1,x2) & in(x2,x3) & Actor(e1,x1) & v_talk(e1))
exists p1 x1 x3.(n_back(x3) & exists x2 x4 x5.((x1 = x2) & in(x2,x3) & of(x3,x4) & n_van(x4) & of(x4,x5) & n_police(x5) & n_criminal(x2)))