Faruk Sepai, 51, was arrested with a foreign-made pistol, a bullet and a magazine from Amragachhia Bazar.
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Rab Khulna-6 said Sepai is a resident of Amragachhia village.
A Rab handout said they conducted a raid in the market place after being tipped-off that illegal firearms were being traded.
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Sepai was arrested from spot and was later handed over to Sharankhola police.