1.   Detectives are still trying to build up a picture of what happened.

2.   Detectives are still trying to work out what happened.

3.   Detectives are trying to build up a picture of the kidnapper.

4.   Detectives are trying to solve the murder of a young girl.

5.   Detectives are still trying to unravel the mystery surrounding his death.

6.   The detective was trying to winkle information out of her.

7.   Detectives are trying to find two men who may have witnessed a murder in a quiet country hamlet.

8.   Detectives are now trying to trace the ringleader of what could be a new international racket.