Several trains, including Lichchhavi Express and a passenger train, were stopped at Kopa Samhauta railway station between Chhapra and Siwan by friends of Lance Naik Premnath Singh, who was among the four martyrs, demanding that the Centre take direct action against Pakistan.
Two other important trains in this section--Vaishali Express and Bihar Samparak Kranti-- were diverted due to the protests, official sources said.
Of the four, Vijay Kumar Rai belonged to Bihta in rural Patna, Shambhu Sharan Singh hailed from Bhojpur district and Premnath Singh and Raghunandan Prasad were natives of Saran district.
As the news of the death of four jawans from Bihar spread, protestors marched through the streets raising anti-Pakistan slogans in Begusarai, Bettiah, Chhapra and other places, reports said.
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BJP workers burnt Pakistan Prime Minister Nawaz Sharif's effigy at Dak Bunglow road in the heart of Patna.
"How long will we accept attacks by Pakistan ? ... Our soldiers are killed and beheaded ... We will not accept any thing less than a military action against Pakistan which is perpetrating attacks on our soldiers," she told reporters at her native village at Bihta.
Chief Minister Nitish Kumar has announced compensation of Rs 10 lakh to the next of kin and state funeral to the four armymen from Bihar.