Four suspected Maoists carrying 300 kg ammonium nitrate, a chemical used in manufacturing explosives, were on Friday arrested from Chakai in Bihar's Jamui district bordering Jharkhand, said the police.
Acting on a tip-off, the police intercepted a vehicle coming from Jasidih in Jharkhand and seized six sacks, each containing 50 kg of the chemical.
The chemical was probably being taken to Charka Pathar in Jharkhand for the local Maoists, sources said.
Of the four arrested, Nageswar Das and Bideshi Paswan were wanted Maoists while the identity of the others is yet to be ascertained, the sources said.