The blast occurred at the supermarket in St. Jodok am Brenner, between Innsbruck and the Italian border, APA reports citing Sputnik.
In a small supermarket in St. Jodok, on the Austrian side of the Brenner, an explosion caused several injuries, a local newspaper reported.
There are fears that there may be people under the debris of the building, which was completely destroyed after the explosion.
Three of the injured were admitted to the Innsbruck clinic and to the Hall hospital in the Tirol.
The explosion triggered a fire.
According to rumours, the explosion could have been caused by work on a gas pipe.