"The incident occurred around 2.50 pm after a man stepped on some explosive material lying underground," Police Commissioner (Rachakonda) Mahesh M Bhagwat told PTI.
Forensic experts and Bomb Disposal Squad reached the spot and a investigation is underway, he said.
The explosive material could be gelatin, buried in the mud, Bhagwat. Local people use gelatin sticks to carry out blasts to scare away wild boars.
The senior police officials who visited the scene said it was a small explosion.
Panic gripped the area after the successive explosions.