imphal three days after suspected national socialist council of nagaland isakmuivah cadres attacked the chopper of chief minister okram ibobi singh at ukhrul manipur police commandos on thursday arrested at least four linkmen and two cadres of the outfit in the aftermath of the attack police commandos carried out massive combing operations in various tribaldominated areas in imphal in the operation imphal east district police commandos picked up four nscn im linkmen from the residence of one r ruivah at fairy lane near khuman lampak sports complex police sources saidthree mobile phones four sim cards and rs 6000 in cash were recovered from their possession all four hail from ukhrul district sources addedduring verification they revealed they had been involved in extortion to raise funds for the outfit the sources said they have been handed over to the concerned police station for further investigation sources addedbesides fairy lane the police also carried out the operation at dewlaland nagaram tangkhul avenue and various hotelsmeanwhile thoubal district police commandos arrested one nscn im cadres amen jangvei aka joy 29 from pallel bazar on thursday morning at around 1030am the cops recovered one 9mm pistol with four bullets and a mobile phone from his possession about two hours later another nscn im cadre identified as mt kasawa 24 was also arrested from forest gate near pallel bazarwhile nscnim has been implicated in mondays attack the outfit on wednesday denied any involvement in the incident and instead said it was a stagemanaged ambush one manipur rifles jawan was injured in the attack when the iaf chopper on which the chief minister deputy chief minister gaikhangam and their ministerial colleagues were on board ascended a few metres above the bakshi helipad at ukhrul the outfit had also exploded two lathod bombs at the town injuring an india reserve battalion jawan the previous nightaccusing the chief minister of not completing the infrastructure development and construction of the hospital at ukhrul the tangkhul naga long tnl on thursday said the chief ministers entry to the district will be banned even if the required infrastructures are provided for the newlyconstructed hospital the cm will not be allowed to enter ukhrul for his antitribal and antinaga policies said tnl president weapon zimik