Three workers were killed and one was after a chemical factory explosion in South Korea Monday, according to the Yonhap news agency.

The explosion occurred at about 1:30 p.m. at a chemical factory in the Yeosu Industrial Complex in Yeosu city, South Korea. Seven people were reportedly working at a section of the factory where chemicals are stored. The three deceased workers were found at a neearbly plant due to the impact of the explosion.

The fire was extinguished and an investiagtion was underway to determine the cause of the explosion.