At least 40 activists of Kamtapur Liberation Organisation (KLO) from three districts of North Bengal went to Myanmar for arms and explosive-making training.
The state intelligence branch (IB) has alerted the police chiefs of Malda, Jalpaiguri and Cooch Behar about this.
The IB said that in small groups, these KLO activists might trigger blasts in various places in North Bengal.
Kalyan Mukherjee, the superintendent of police (SP), Malda, said the police were maintaining strict vigil.
According to a state IB officer, a group of youths from North Bengal went to Myanmar through the Assam border while taking advantage of the porous Indo-Bangladesh border and some also went through Bangladesh.
For meeting the transport cost, they targeted some businessmen of North Bengal, especially of Malda, and extorted them.
“They are kidnapping the businessmen for extortion but the problem for us in tackling the menace is that after returning home, these businessmen are not cooperating with the police. In some cases they are denying they were kidnapped,” said an IB official requesting anonymity.
In the recent past, senior officers from North Bengal districts met to discuss the movement of KLO.
“According to information we gathered, the KLO activists at present will not carry out any big massacre but to convey a message about their presence, they will trigger small blasts and try to gather more support from the people of North Bengal. Another thing they would do is to threaten businessmen to extort hefty amounts from them,” an officer said.
The police think KLO chief Jiban Singha might have met these newly recruited youths in Myanmar while they visited the country for training.