21.   The police are trying to find out who was responsible.

22.   The police are trying to tackle car crime head-on.

23.   The police try to keep rival supporters apart at all matches.

24.   When police tried to push back the crowd, a few youths retaliated by throwing stones at them.

25.   When the police tried to advance they were bombarded with petrol bombs.

26.   Police are still trying to figure out who paid Trebble off.

27.   Police are trying to reconstruct the sequence of events on the night of the murder.

28.   Police are trying to piece together his movements before the murder.

29.   Police are trying to discover the identity of a baby found by the side of a road.

30.   The police have been trying to prevent them carrying weapons.