Premier US investigating agencies knew about David Coleman Headley's link with a Pakistan-based terror outfit one year before 26/ 11, a Union government source claimed on Tuesday.
According to a long-standing home ministry's (MHA) doubt, the CIA came to know of the terror merchant's connection with the Lashkar-e-Tayyiba (LeT) when it started tracking him in October 2008.
But the US sleuths chose not to convey the information to their Indian counterparts while he was freely travelling across India.
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