Ganaram Reang, Danasai Reang and Salendra Reang, belonging to the National Liberation Front of Tripura (NLFT), surrendered in Kanchanpur in northern Tripura on Saturday night, a police official said.
They told the police they recently fled from the NLFT camps at Sapchari in Chittagong Hill Tracts in southeast Bangladesh.
According to them, more NLFT cadres from Bangladesh were likely to surrender, the official added.
Twelve NLFT rebels with a huge quantity of arms and ammunition surrendered to the Tripura Police chief K. Nagaraj on April 11. They also escaped from the same NLFT den in Bangladesh.
Police officials said the three militants had fled along with the previous 12 ultras but could not surrender together, as they had entered Tripura through different routes.
NLFT cadres and All Tripura Tiger Force (ATTF) militants undergo arms training in hideouts in Bangladesh, which shares an 856-km border with Tripura.
Banned in 1997 by the union home ministry, the two outfits advocate secession of Tripura from India. However, ATTF has become almost defunct due to the surrender of most of its cadres. (IANS)