In 1901, it was therefore, decided that the Central Special Branch which was responsible only for the collection of political intelligence should be expanded to include a small staff of selective detective agents, to be employed to monitor political movements as also to deal with those forms of organised crimes which extended beyond the limits of a single province.

As early as in 1908, the Special Branch had set up some centres in places where the existence of underground organisations had come to light.

It, however, goes without saying that the Intelligence Branch in Bengal showed exceptional ability in dealing with the terrorist violence during the period before Independence.

Its excellent source work and innumerable channels of information eventually resulted in unearthing of all the groups responsible for terrorist violence.

Khondokar Rafiqul Islam, Additional Inspector General of Bangladesh Police, is the current head of Special Branch.

The school trains officers in courses on intelligence-gathering, surveillance, immigration control, and VVIP protection.