Three people suffocated to death during an unspecified car test at a Hyundai Motor plant in the South Korean city of Ulsan on Tuesday, the Yonhap news agency reported.

Three researchers died of suffocation during vehicle testing at a Hyundai Motor plant in the southeastern city of Ulsan here on Tuesday, officials said. The three -- two Hyundai researchers and the other affiliated with a subcontractor -- were found unconscious at a test chamber where they were