One of the prime accused of the Mumbai serial train blasts in 2006 may have been involved in the Ahmedabad blasts. The intelligence agencies are trying to track Zulfikar Kagzi, a native of Rajasthan, and Sayyad Sheikh in connection with the Ahmedabad blasts.Kagzi is considered to be an expert in manufacturing bombs by using ammonium nitrate. Both accused were members of the banned outfit Students Islamic Movement of India.