The blast occurred on the railway track last night about eight km south of Mazbat damaging a reinforced concrete cement (RCC) line sleeper, IGP L R Bishnoi said.

The explosion with a loud sound had occurred at around 9 PM but none reported it to police with the people thinking football fans had burst firecrackers to celebrate the Northeast United's win in the ISL football game, the police official told.

At the blast site, the letter pad of militant outfit United Gorkha Peoples Organisation (UGPO) was found and investigations are on, Bishnoi said.

There is no information about the involvement of the NDFB(S) underground group in the blast, he added.

Another bomb was recovered on the same railway track this morning at Rowta in the district during investigations by police, Bishnoi stated.

A bomb defusing squad along with CRPF Cobra team were searching the area for more bombs and railway technical staff were monitoring the track, he said.

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