The squad from Patna was diffusing six bombs at an isolated place in Goriari village when two bombs burst, Superintendent of Police (City) Kumar Ekle said.
However, there was no casualty or injury to any one due to the blast, he said.
The police had recovered the bombs from five miscreants from a mango orchard in the village while they were hatching a criminal conspiracy, Ekle said adding a country-made pistol, two cartridges and two knives were also recovered from them.