Two British police forces have begun trials of a sophisticated computer software package which aims to boost their efficiency by predicting where and when future crimes will take place.

The system, known as Crush (Criminal Reduction Utilising Statistical History) evaluates patterns of past and present incidents, then combines the information with a range of data including crime reports, intelligence briefings, offender behaviour profiles and even weather forecasts. This is used to identify potential hot spots and flashpoints, so police forces can allocate resources to areas where particular crimes are most likely to occur.