NEW DELHI Indian authorities are shortly expected to file a chargesheet against Hindutva leader Swami Aseemanand and others in the 2007 Samjhota Express blast, where 43 Pakistani nationals were among the 68 killed. Indias National Investigation Agency (NIA) had taken over the probe in 2010, and arrested Aseemanand in last December, reported Times of India on Sunday. The move comes less than a week ahead of the foreign secretary-level talks between India and Pakistan. NIAs investigation into the Samjhota train attack may give Pakistan a handle to embarrass India. Indian officials are wary of the possibility of Islamabad asking for Aseemanands custody once he is chargesheeted.