1.   Detectives are working on a theory that he knew his murderer.

2.   Detectives are working on the theory that he could have arrived home to find his flat in Bisley Court, Darlington, being ransacked and paid the ultimate price.

3.   Detectives are working on the theory that a rogue loner, rather than a terrorist cell, is responsible.

4.   Grampian detectives are working with officers in Cambridgeshire, Lothian and Borders and Northern Constabulary.

5.   As the detectives worked, community activists pleaded with the public to provide tips.

6.   Briefed about shootings plaguing one housing project, he demanded that his detectives work harder to plot the inner workings of two newly identified street gangs struggling for turf.

7.   But police are limited in how much time they can spend on cases, and most homicide detectives work several cases at once.

8.   Detectives worked most of the day Saturday, but planned to take today off.

9.   Detectives work cold cases using the latest technology.

10.   Disease detectives would work around the clock to find the source of the anthrax.