Smoke was seen coming from the second floor of a building as debris and broken glass were found scattered across the area. Witnesses reported that they smelled gas before the explosion.
Ednews informs via DW that an explosion at a building in Tokyo's Shimbashi commercial district on Monday left four people injured, Japan's state media NHK reported.
The explosion scattered debris across the streets, shattered windows and spewed smoke into the air.
The fire broke out in a building in a busy restaurant area around 3:20 a.m. local time (0620 UTC). Shimbashi is known as a business and entertainment district in central Tokyo.
Police rushed to the site after receiving an emergency call, local media reported.