The four victims, part of a group of lemon traders, went to Labdanguri market in Salbari sub-division from adjacent Barpeta district last evening but did not return.
"It is suspected that they have been kidnapped by the National Democratic Front of Bodoland (Songbijit) militants," Baksa Additional Deputy Commissioner Bhawani Prasad Sharma told PTI here.
Following this, indefinite curfew was clamped in Salbari.
"Indefinite curfew has been imposed in Salbari sub-division under Gobardhana police station," Sharma said.
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Seshan said four cycles and sandals were found from a nearby area.
The four missing persons have been identified as -- Bakar Ali (13), Saddam Ali (13), Ataur Rahman (27) and Rahul Amin (45), he said.
In May this year, 50 persons were killed in Baksa and Kokrajhar districts of the Bodoland Territorial Area Districts by suspected Bodoland Peoples Front-supported insurgents.