According to officers, the 53-year-old man planned and carried out his scheme "alone".
The email said he had already poisoned five jars of baby food as proof the threat was serious.
Officials said they believe all of the contaminated food has been found but warned shoppers to remain alert to any possible signs of product manipulation. They received 650 tips in response. He said he could not give further examples, however, because he didn't have the suspect's record.
Through the video surveillance of the stores where the baby jars were identified, police were able to obtain images clearly showing the face of the 55-year-old man, who has not been named. He did not rule tacking on charges of attempted murder, as well.
CCTV grabs released by police show the suspect
One or more blackmailers have threatened to poison food products in shops in Germany and elsewhere in Europe unless they receive millions in cash, police warned on Thursday.
Police and US military officials in Germany are warning consumers who buy food or medicine on the local economy to look out for tampered products after jars of baby food in southern Germany were found to be poisoned. Employees found the tainted jars at several unnamed grocery stores in the city of Friedrichshafen on Lake Constance last week, said police from the state of Baden-Wuerttemberg. The substance is colorless, odorless and has a sweet taste, but can lead to brain damage, kidney failure and death if consumed.
While police believe they do have the suspect in custody, there was reportedly no confirmation that it was the man pictured in the surveillance images. He left the store before they could stop him.
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