An employee of the municipality of Sulza in Thuringia was seriously injured - when trying to remove molehills with Böllern.
The 47-year-old was taken to hospital with injuries to the foot and eye, police said in Jena. According to initial findings, the man had put the Böller in the molehills on Tuesday afternoon and set fire.
He stood with his foot on one of the hills. He injured himself in the explosion.