11.   They were on a school trip to Pembroke Dock in West Wales and were setting off on their last visit when the crash happened.

12.   The crash happened at a notorious accident blackspot.

13.   I had just got up from my chair when the crash happened.

14.   It showed tyre marks on the road close to where the crash happened.

15.   He closed his eyes as the crash happened.

16.   The crash happened on the A-Forty at Wheatley between Oxford and Thame where a contra-flow system is in place because of roadworks.

17.   The crash happened yesterday morning when the goods train left the rails as it entered Maidstone East station.

18.   An illegal operation crash usually happens when two programs lay claim to the same chunk of memory.

19.   A TRAGIC ECHO Airplane voice recorders often help investigators understand why a crash happened.

20.   All the fatal crashes involving soldiers happened on weekends.