Parasnath Hills is one of the most important pilgrim centres for Jains.
The security personnel stumbled on the bomb making factory at Dholkata village in the course of a search operation in naxal-affected area, CRPF Inspector General Sanjay Anand Latekar.
The security personnel also recovered two containers of explosive containing explosives weighing 20 kg each and other substances, he said.
Latekar said the factory has been sealed and a massive search operation has been launched in the area.
The seizure was made based on the input provided by a naxal sub-zonal commander who was arrested along with 12 other left wing extremists from Giridih district on March 5.
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