Giant Korean chaebol Samsung has asked a US firm and experts from medical schools to assess whether its semiconductor fabs in Seoul are responsible for a number of cases where employees contracted leukaemia.
Ten workers in its fabs have died from lymphona or leukaemia while 15 others have contracted the diseases.
Those figures are contradicted by a group of workers who have claimed that 20 people have died and 60 have come down with the diseases. The group, called the Guardian of Health and Human Rights of Semiconductor Workers want the investigation to extend into the past, when some of the ex-employees worked at the Samsung factories.
The group coordinating the review of the fabs will be a US consulting company Environ Holdings, Samsung said.