AN ISLAMIC State bomber discovered with a plastic bag full of excrement, animals testicles and explosives, is a chilling warning the terror group are planning for biological warfare, according to an expert.

Mohamed Abrini was said to have made the rudimentary bomb with the intention of spreading bacterial infection when he wreaked havoc in the worst terror attack in Belgian history.

The 31-year-old, who was also involved in last year’s Paris attacks, was identified as the “man in the hat” after going on the run following the suicide bombings which resulted in 32 deaths and 270 injuries at the airport and at the city’s Maelbeek subway station.

Now a leading expert says the animal testes bomb shows ISIS leaders are continually trying to develop terrifying biological weapons – even in their crudest form – to literally sicken the public.

Dr Amesh Adalja, a Senior Associate at the University of Pittsburgh Medical Center for Health Security, said: “The news that ISIS may have been interested in a biological weapon is not surprising, as terrorist groups from Al Qaeda and Aum Shinrikyo have expressed this same effort.

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