By Rupam Jain Nair and Andrew MacAskill NEW DELHI (Reuters) – The National Investigation Agency (NIA) has uncovered a suspected plot by banned Bangladeshi militant group Jamaat-ul-Mujahideen to assassinate the country’s Prime Minister Sheikh Hasina and carry out a coup, three senior Indian security officials told Reuters on Tuesday. India will hand over a dossier to Bangladesh with details of the plan by members of the Jamaat-ul-Mujahideen, which has carried out scores of attacks in India’s eastern neighbour, the government and police officials said. Bangladesh did not comment directly on the assertions that Hasina had been the target of a plot, but said it had tightened security on the border with India. Mainly-Muslim Bangladesh has suffered three major army coups and two dozen smaller rebellions since gaining independence from Pakistan in 1971 in a war that killed and displaced millions.