SEOUL, Feb. 6 (Yonhap) -- Cancer-inducing elements were detected at semiconductor plants operated by three firms including Samsung Electronics Co., a study showed Monday, renewing concerns about the health of their workers.

The detected levels of carcinogens such as benzene, arsenic and formaldehyde were unlikely to pose risks of cancer, but their presence was enough to give cause for concern, according to the study by the state-run Occupational Safety and Health Research Institute (OSHRI).