Samsung is under investigation after two employees were hospitalized following exposure to X-rays on May 27th, South Korea’s Nuclear Safety and Security Commission (NSSC) announced. The exposure took place at Samsung’s Giheung chip plant, about 25 miles south of Seoul, writes CNBC.

The two employees were exposed while using a machine that blasts materials with X-rays in order to analyze them. Both showed “abnormal symptoms” due to radiation exposure on their fingers, the NSSC writes in its release. The agency says their blood tests came back normal, but it plans to conduct follow-up testing. Use of the machine has apparently been suspended, and the agency says it plans to figure out exactly how much radiation they were exposed to.

Samsung said the employees “experienced accidental exposures to X-rays on their hands,” in a statement to CNBC. It further told the outlet that it’s supporting the employees’ treatment and is cooperating with authorities. Meanwhile, the NSSC says it will take further measures if it finds that Samsung has violated any safety laws.