A worker was caught on camera poisoning his colleagues by pouring caustic soda into a water cooler.
CCTV footage showed how he glanced over his shoulder to check he was in the clear as he walked towards the dispenser.
He could be seen lifting up the water jug and swiftly emptying a container into the unit before retracing his steps.
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The police were called after a second person at the company fell ill after drinking water from the cooler.
Detectives reviewed footage from the warehouse in Canoas, north of Porto Alegre, Brazil.
They arrested a suspect on Thursday (27 Mar), as reported by Need To Know.
Forensic experts analysed samples of water from the cooler and confirmed that liquid caustic soda had been added.
Just a small amount of the alkaline solution can cause mouth burns, internal damage and even shock, which can lead to multi-organ failure.
Luckily, the poisoned workers are in good condition and are not at risk of dying, according to the company.
The 31-year-old suspect has been remanded into custody on accusations of poisoning potable water.
If convicted, he could face from 10 to 15 years in prison.
He gave his version of events to the police, who are currently withholding the information he provided.
The police say they still do not know the motive.
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