However, at the same time, he accused the media of twisting his comments out of context.
"I regret my remarks giving clean chit to Pakistan for the killing of five Indian soldiers on the LoC in Jammu and Kashmir on Tuesday last," Singh told media at a hurriedly-convened press conference at his official residence.
"I am sorry if my remarks have hurt the sentiments of any individual," he said categorically, but again shifted the blame on media for "twisting" his remarks out of context.
He admitted that he has been issued a show cause notice by the JD(U) national president Sharad Yadav and said he will reply soon.
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On being told that his remarks have caused huge embarrassment to Chief Minister Nitish Kumar on top of an insensitive comments for the armed forces by his ministerial colleague, Singh said: "I have already regretted my remarks....
He, however, defended his remarks describing Pakistan as a younger brother and a neighbour and said it was outcome of his socialist ideology and a vision that India should have good relations with all its neighbours.