New Delhi: The National Investigation Agency (NIA) on Thursday started its probe into the train derailments in Kanpur in Uttar Pradesh, Kuneru in Andhra Pradesh and Bihar's Ghorasahan case in which an IED was found near a rail track.

The agency action came after a green signal from the Home Ministry, which on Thursday handed over the Kanpur and Kuneru train derailment cases to it. The Ghorasahan case was handed over to the NIA on Wednesday.