Fire crews spent hours controlling a massive fire that gutted two businesses and damaged at least two others in the South Okanagan community of Osoyoos Sunday morning.

Chief Rick Jones of the Osoyoos Fire Department said the blaze was reported at about 8:45 a.m. at the Christian Ministry Thrift Store on Main Street.

"Three units arrived on scene and the windows were black and smoke was coming out of the eaves already," Jones said.

Fire crews from neighbouring Oliver were called in to help control the blaze, but both the thrift store and a dollar store were destroyed.

Neighbouring businesses, including a denture clinic and CIBC bank branch, are believed to have sustained smoke damage.

Iris DeVries of the Christian Ministry said the thrift store was not insured, and a $12,000 antique piano was among the items destroyed in the fire.

"Our other piano we use for church, that's gone. Computers, furniture, that's all gone," DeVries said. "I'm shaken and I don't know why this happened, but I know something good will come of all this."

Authorities say no one was inside the building when the fire broke out, but a church service was scheduled there just hours after it was reported.