Unidentified militants planted the powerful bomb near the Assam Rifles camp.
The injured were admitted to hospital, police said.
Re-enforcement of security forces including Assam Rifles and Manipur Police were sent to the spot after the blast.
A search operation was conducted in and around the transit camp like the Khuman Lampak Sports Complex and Namthallong village, police said.
No militant group has claimed responsibility, they said, no one has been arrested.