A man caught on surveillance cameras after an explosion outside a public restroom at Tokyo's Yasukuni Shrine on the morning of Nov. 23 is South Korean and has already flown back to his country, investigative sources said Thursday.

The man entered Japan just a few days before the incident and left on the day of the explosion, the sources said.

Security cameras around the restroom captured a man in dark clothes wearing glasses and carrying a backpack and a bag approximately 30 minutes before the blast at the shrine, which is viewed as a symbol of Japan's militarist past in China and South Korea.