A suspected gas explosion and subsequent fire injured 42 people in Sapporo, Japan, Sunday night.

The wooden building, which crumbled and was reduced to ashes, contained a pub, a real estate agency and a clinic, according to Kyodo News. The blast happened at 8:30 p.m. in the Toyohira ward of the northern city, which is the capital of the Hokkaido island.

A 32-year-old employee in the real estate office was seriously injured, according to Kyodo News. The force of the explosion shattered windows of nearby condos and restaurants, while the ensuing fire burned for more than five hours.