Sniffer dogs learn to identify 'undetectable' explosives

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.