"If the terrorists were not from Pakistan, then who were the terrorists who attacked the Pathankot base?" Congress General Secretary Digvijay Singh said.
The government needed to clarify its position on the NIA chief's statement, he said.
More From This Section
"Prime Minister Narendra Modi, Home Minister Rajnath Singh and the national security adviser need to answer who were these terrorists," the Congress leader said.
NIA's "clean chit" to Pakistan was a complete failure of Indian diplomacy, Singh said.
The Congress leader also took a swipe at Defence Minister Manohar Parrikar, saying he was more concerned about Goa, his home state, than the country.
"Parrikar is hardly the Defence Minister. He is Super Chief Minister of Goa," he said.
Singh was here to participate in a function to release a book 'Public Matters', written by former Union minister of state for External Affairs Eduardo Faleiro.