31.   By the time the police arrived the men had already cleared out.

32.   He managed to fend off his attackers until the police arrived.

33.   They managed to hold off their attackers until the police arrived.

34.   When the police arrived, one man ran away and the other made his escape in a car.

35.   Police arrived after protesters began sitting in at the state capitol building.

36.   The police arrived on the scene and began moving the protesters on.

37.   The police arrived to keep watch on the mouth of the tunnel.

38.   The speeding motorist was pinned to the ground by angry locals who took the law into their own hands until police arrived.

39.   He then held the man in an armlock until police arrived.

40.   Ness chased the thief down and held him until police arrived.