This photo shows the entrance of a military base where an explosion occurred injuring three civilians in Gimhae, South Gyeongsang Province, Dec. 23. Yonhap

Three civilians were injured in an explosion at a military base in this southeastern city on Monday, authorities said.

The explosion occurred during an inspection of a recently constructed tank facility for hazardous materials at the base of a logistics support group in Gimhae, about 310 kilometers southeast of Seoul, at 9:27 a.m., according to the police and firefighting officials.

The exact cause of the accident is under investigation.

The three who were injured suffered burns but were not in life-threatening condition. (Yonhap)