Addressing a press conference here, Dr Singh said Pakistani allegations to this effect were 'totally wrong'.
He said, "We are not in the business of exporting terrorism to Pakistan or any other country. The people and government of Pakistan jolly well know that this is a false accusation."
Prime Minister Manmohan Singh also demanded that Pakistan should try and punish those who masterminded the Mumbai terror attack in 2008.
"They should investigate all those who are involved (in that attack) including Hafiz Saeed, Lashkar-e-Taiba and Jaish-e-Mohammed. There should be a fair trial which will result in proper punishment being given to them. We have not lost hope."