A 57-year-old man has been jailed for life after putting poison in his colleagues' sandwiches.
The German man, known only as Klaus O, left one colleague with permanent brain damage, and two others with serious kidney damage after putting lead, cadmium and mercury in their food.
He was arrested last year after he was caught on video putting suspicious powder on their sandwiches at the metal fittings company in north west Germany where he worked.
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When police searched his home they found a laboratory and a substance that Judge Georg Zimmermann described as "more dangerous than all combat agents used in World War II".
A 27-year-old and 67-year-old suffered chronic kidney damage as a result of the poisoning, with a 23-year-old trainee falling into a coma after ingesting the mercury.
Prosecutors believe Klaus O wanted to see his colleagues' physical decline, although the man refused to speak during his trial.
The judge said the crimes were as serious as homicide, and ordered the man to be detained in prison after completing a life sentence - around 15 years in Germany - because he remains a danger to the public.