Sniffer dogs learn to identify 'undetectable' explosives
8 November 2013 Last updated at 10:50 GMT
A canine academy in South Africa says it has found a way to train sniffer dogs to identify a previously undetectable type of peroxide-based explosive.
It is thought that TATP - or "Mother of Satan" - has been used in a number of terrorist attacks in recent years, but it is far too volatile to be used in training exercises.
Mark Eames reports.