Militant factions such as Zeliangrong United Front (ZUF), NSCN factions and other groups were operating in the district.
In the latest incident on June 21, two civilians and four militants were killed in an exchange of fire between ZUF and NSCN (K).
The sources said the authorities were considering deployment of the army, police and other forces during the combing operation, but a final decision was yet to be taken.
A high-level meeting presided over by Manipur Home Minister Gaikhangam yesterday reviewed the situation.
The meeting was attended by Director General of Police Y Joykumar, GOC 57 Mountain Division Maj Gen Binoy Poonen, home department officials and representatives from security agencies, the sources said.