The blast occurred in a godown at Shastrinagar in Tiroda village on the outskirts of Nanded, around 600 km from Mumbai, shortly after midnight, they said.
A bomb squad was rushed to the spot. There was no prima facie evidence to suggest any terrorist angle in the incident, police said.
The godown stored biscuits and pickle jars. The blast may have been caused by "some chemicals" at the spot, police said.
Industry Minister Ashok Chavan, who hails from Nanded, visited the spot on Saturday.