1.   A crowd was beginning to collect around the scene of the accident.

2.   A crowd was beginning to form at the scene of the accident.

3.   An hour or so before the press conference, a crowd begin to collect outside the building.

4.   As the firing commenced the crowd began to disperse.

5.   At the appointed hour for the concert to begin, crowds began streaming off the parade route and into the park.

6.   Once the ambulance had left, the crowd began to disperse.

7.   Seeing there would be no more entertainment, the crowd began to disperse.

8.   The crowd began dispersing as soon as the ambulance had driven away.

9.   The crowd began to clap, and some of them laughed with delight.