Two men and two women were taken to the hospital, according to the Asahi news outlet. The website 47news.jp is also writing that there are a number of unconscious and missing people.
LiveDoor News reported that around a dozen people are injured, and that the fire began on the first floor of the building. The structure is said to be located about one kilometer from the city's main train station.
The area is crowded with restaurants and cafes. A large number of ambulances and firefighters was reported to be at the scene, causing traffic jams.