The arrests were made in connection with the kidnapping and killing of two Manipuri youths in July, a case that had stirred widespread public outrage. The CBI had arrested four people in the case who have been taken to Guwahati, Assam.
The 48-hour statewide shutdown continued on the second day with roads blocked, but no sounds of tear gas shells and mock bombs were heard unlike the first day.
The suspension of mobile internet service in Manipur for the past 18 days has badly affected important banking, government and non-government services since May 3.