A propane tank exploded at a Super Wal-Mart in London around 4 p.m. Friday, rocking customers and damaging the store.
One man was taken to a hospital and two others were injured from falling lights and debris at a nearby Walgreens that had just opened on Friday, said London Police Lt. Stewart Walker.
It was still unclear exactly what caused the explosion, but a white Chevrolet pickup truck emitting white smoke pulled into the auto and lube center at the Wal-Mart store, Walker said.
In the back of the Chevy was a 100-pound propane tank and it is thought something caused the tank to explode, Walker said.
The truck driver was thrown from the vehicle and later taken to St. Joseph's Hospital in London.
Several hanging ceiling lights and other equipment in the auto care center were damaged, as well as the rubber roof. The newly opened Walgreens in an adjacent lot also sustained damage, but is expected to be open.
The Kentucky State Fire Marshal and Bureau of Alcohol, Tobacco, Firearms and Explosives are investigating, Walker said.