Srinagar, April 28 -- The National Investigation Agency (NIA) has taken over the investigation of the Pahalgam terror attack in which 25 tourists and a local resident were killed on Tuesday."NIA teams, which have been camping at the terror attack site since Wednesday, have intensified the search for evidence," the spokesperson of NIA said.The teams, overseen by an Inspector General, a Deputy Inspector General and a Superintendent of Police from the anti-terror agency, are examining the eyewitnesses who had seen the horrifying attack unfold before their eyes at the peaceful and picturesque Baisaran Valley."The eyewitnesses are being questioned in minute detail to piece together the sequence of events that led to one of the worst terror att...