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Hunting terrorists by monitoring wastewater

September 30, 2014 at 08:18 clock Updated BST

The new technology allows security services to analyze the contents of the sewers to find out where people make homemade bombs.

The new system is currently being tested in Sweden and will be possible for substances that are byproducts of the manufacture of bombs are to be sought.

Many of the recent attacks, including Boston, London and Madrid, were the result of terrorism, "house", which could help to reduce the risk of different attacks.

Rebecca Morelle reported from Stockholm.