Bengaluru, Oct 23 (UNI) The possibility of an improvised explosive device (IED) being used in the explosion at an under-construction building in Bengaluru has come under scrutiny, with the National Investigation Agency (NIA) examining the case as investigators race to establish the source of the blast, its intended target and the motive behind it. The October 20 explosion on the fourth floor of a building on Jeremiah Road in Pulakeshinagar injured two people - a construction worker from Assam, Allauddin, and a security guard from Uttar Pradesh, Suraj. The blast has triggered an intensive investigation, with police exploring multiple leads…