21 spots in four southern dists 'vulnerable'

The districts are Khulna, Jessore, Jhenidah and Magura.

Additional forces have been deployed at the spots since Friday night. Special security measures have been taken in view of human well programme from Mongla to Sunamganj on December 30.

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Seven outlawed parties formed an alliance vowing avenge to killing of Mofakkhar Chowdhury, general secretary of outlawed Purbo Banglar Communist Party (PBCP-ML) in a 'crossfire' by Rapid Action Battalion (Rab) on December 17 in Kushtia.

All upazilas in Bagerhat have been put on red alert in the wake of threat by outlawed parties, according to a senior police officer.

Combing operations are going on in the Sundarbans and all river routes, the official added.