Four persons, including a woman, were arrested in this connection.
A special team of city police under the supervision of Itanagar SDPO Bomge Kamduk arrested three extortionists from Itanagar and Nahrlagun on October 30 last while the woman was arrested from Naharlagun on November 3 last, Capital SP Seiju P Kuruvilla said.
The woman has been identified as Nabam Yani (35) from Mengio, while her three accomplishes were identified as Khoda Taji (34) from Pungte village under Palin, Bake Kepo (20) from Sangram and Giogi Rock Bhai (20) from Sangram.
The police recovered 60 NLCT letter pads, one kg ammonium nitrate, 8 electronic detonators, one timer device and one 0.315 Rifle with seven rounds of live ammunition, the SP said.
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In addition, the police team seized two cars used by the criminals for extorting money.
The team also seized literature material of NSCN (National Socialist Council of Nagalim) and ULTA (United Liberation Tribal of Arunachal), the SP added.
Multiple cases of extortion have been registered at various police stations of the capital complex and all the accused have been remanded to police custody for further interrogation, the SP said and appealed to the people to intimate anti-extortion cell about any information regarding extortion in the state capital.