Three workers have been injured at a Samsung chip plant in Hwaseong, 37 miles south of Seoul, following a highly poisonous hydrofluoric acid gas leak. The incident comes just three months after 10 liters of diluted hydrofluoric acid, a colorless poison that can damage the lungs and bones, and even affect the nervous system, was leaked at the same plant.

Following January’s incident, four workers were hospitalized and one was killed. Samsung issued a public apology and vowed to prevent the same thing happening again. The company was also fined $1,000 for failing to report the leak immediately.

It took workers almost 14 hours to notify the authorities of the incident, by which time one employee had been killed and another four were hospitalized with serious injuries.

It’s thought that Samsung’s penalty this time around will be much stiffer, with its safety practices already under scrutiny after January’s incident.

• SourceYonhap News