The bomb, attached to a remote-controlled device, was planted on the side of a road at Bongyang village to attack security personnel passing through the area, police said.
Nobody was injured in the explosion, police said.
No individual or group has claimed responsibility although major insurgent organisations have been operating in the area near the international border, police said.
In another incident, commandos attached to interior Thoubal district, aided by personnel of 40th Assam Rifles battalion, arrested two militants of United People's Revolutionary Front (UPRF) today, Sub-Divisional Police Officer of Lilong police station in the district Lalboi Haokip said.
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Two militants of UPRF who had kidnapped two persons for ransom on September 2 last were arrested this morning, Haokip said, adding that the two were identified as Anish Khan (25) and Md Riyaz Udin (24).
The names of the kidnapped persons who were rescued have not been revealed by the police officer.
Haokip said one 9 mm pistol used in the kidnapping of the two persons was recovered from the possession of the two militants.