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of a banned extremist group -- and two dismissed army personnel. The letter, however, did not name the organisation.

Police Headquarters warned that these individuals may carry out attacks on “state important installations,” including the National Parliament, Shahbagh intersection, and various places of worship. Police and army establishments, as well as entertainment centres, were also listed as potential targets.

The letter added that the group may have plans to target armouries of different forces as part of their preparations.

“They are extremely risky for the overall security of the country,” the letter stated.

Profiles of the two alleged planners -- hailing from Sylhet and Dhamrai in Savar -- were attached to the letter.

In light of the threat, Police Headquarters instructed all concerned authorities to strengthen security at the mentioned locations, increase surveillance, and take appropriate legal action against those involved.

The letter was circulated to senior officials of multiple units, including the Rapid Action Battalion (Rab), Special Branch, Criminal Investigation Department (CID), Anti-Terrorism Unit, highway police, industrial police, metropolitan police commissioners, range DIGs, and district superintendents of police nationwide.