Manipur divides into 3 parts?

The report to Home Minister Amit Shah divides Manipur into three distinct parts, each represented by a different colour. This category most likely reflects the security forces' administrative strategy or mode of operation. Regardless of the technicalities, the Central Government clearly recognises the isolation of tribal communities from mainland India. The colours also represent Manipur's three primary communities: Nagas, Meitei, and Zo people (which include the Kuki, Zomi, and Hmar). 

~ The Tribal Post