Three workers die in Hyundai car test in South Korea

Three workers died during a car test at a Hyundai factory complex in South Korea on Tuesday afternoon, police said. 

The three were found unconscious in a car while they were testing it in a "chamber" at the plant in the southeastern city of Ulsan, according to a union official.

Two of the workers were Hyundai researchers involved in car testing at Hyundai's No.4 factory, which is the company's biggest manufacturing facility, a local police officer said.

The officer reported police and the labour ministry were investigating the incident.

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According to local reports, the workers died of suffocation.

The plant has its own port and an annual production capacity of 1.4 million vehicles, including exports of 1.1 million units.