"The circumstances, as well as the experiences, pointed fingers at Pak-based Jihadi groups. Haryana Police, who had managed to reach the source of suitcases used in the blasts, conducted the initial investigation. The attacks had clear imprints of involvement of SIMI recruits. The SIMI chief, Safdar Nagori, was said to be the mastermind of the conspiracy. The narcotics, brain mapping and lie detectors conducted upon him confirmed this suspicion. Nagori was also an accused in the 7/11 Mumbai train blasts. It was during the interrogation related to this case that he revealed that some SIMI activists had colluded with Pakistani terrorists to carry out the Samjhauta Express blasts. The advanced explosive used in the terror operation indicated help from across the border."