TOKYO, Jan. 15 -- A fishing boat capsized after collided with a Japanese Maritime Self-Defense Force's (MSDF) transport vessel early Wednesday morning, leaving two people in critical condition, according to local media.

The accident, which took place off Japan's Hiroshima Prefecture, made four people fall into sea and two of them were in critical condition, said Japan's broadcaster NHK.

Japan's Defense Ministry said that the MSDF vessel collided with the capsized fishing boat, while the Japan's Coast Guard is investigating the accident.