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Previous reports said he was kept inside a notorious detention facility - known as Aynaghor, or "House of Mirrors" - inside the main intelligence headquarters in Dhaka, but investigators now believe there were many such sites.

One risk assessment he worked on in Dhaka, the capital of Bangladesh, estimated that about 70,000 structures or buildings would collapse from an earthquake of similar magnitude.

The letter also contains a detailed rebuttal of allegations made by the ACC to the media that Siddiq was involved in the appropriation of land in Dhaka.

The dramatic political developments in Bangladesh that led to prime minister Sheikh Hasina being ousted last year have thrown up many surprises - including Dhaka's growing closeness with one-time foe Pakistan.

The one I find really grating is the traffic noise from Dhaka, Bangladesh, which has the title of the noisiest city in the world.