The US-Mexico border is presented as a war-zone in the new action crime drama Sicario, which stars Emily Blunt as part of an interagency task force out to get top members of a Mexican drugs cartel.

The operation is led by men whose motives are not clear - and who do not operate by the book.

Actors Josh Brolin and Benicio Del Toro are also part of the cast. Talking Movies' Tom Brook reports.