As per reports, the heroin is worth over Rs 3 crore in the international market.
The accused, identified as MD Munal Khan (42) was arrested in Kwakta Bazara with the heroin wrapped in 49 soap boxes.
Khan was apprehended by a police team who were on frisking and checking duty as part of a preventive measure ahead of the state's upcoming elections.
Him along with the seized heroin were handed over to Moirang police station for further legal proceedings.