Speaking to reporters here, Union Home Secretary G K Pillai said, "We have not given clean chit to anyone. Investigation is still on."
National Investigating Agency team (NIA) reached Mumbai on Nov 14, to probe the activities of Headley and Tahawwur Hassan Rana, a Canadian of Pakistani origin, arrested by FBI in connection with the plot.
According to the investigating agencies, Headley had met Rahul during his visit to Mumbai. His name also cropped up in several email conversations with co-accused Tahawwur Rana.
Headley and Rana were arrested for suspected links with Pakistan-based terror group Lashkar-e-Taiba, which had carried out the Mumbai carnage 2008 that left 183 people dead.
When asked about police failure to get an inkling about the plot while the two were in Mumbai to do a recce ahead of the 26/11 attacks, Pillai said, "Primarily they had come before Nov 26, 2008, that is why."