21.   The police soon arrived at the scene of the crime.

22.   They managed to pin him down until the police arrived.

23.   They were careful not to touch anything until the police arrived.

24.   We called the police and ambulance but it was a long time before the police arrived.

25.   When police arrived, Black made no effort to hide or conceal herself.

26.   When police arrived, the two men fled.

27.   When the police arrived to arrest her, she realized she had been duped.

28.   When the police arrived, the crowd broke up very quickly.

29.   The police arrived and managed to calm things down.

30.   The protesters slowly cleared away from the building when the police arrived.