Lahore, Jan. 1 : Pakistan's National Security Adviser (NSA), Major General (retired) Mahmud Ali Durrani has admitted that Pakistan does not have enough proof to rule out the possibility that Ajmal Amir Kasab, the lone surviving terrorist involved in the November terror attacks on Mumbai, is not a Pakistani.

"Could be. I am not saying more than that because we don''t have... I hate to say this, we don''t have proof," The Daily Times quoted Durrani, telling a private television channel.

Pakistani media had earlier had claimed that Kasab belonged to Faridkot in Pakistan's Punjab province. Kasab's father reportedly admitted to the media that Kasab was his son.

According to Pakistani media, Kasab visited his village to seek his mother's blessing before going for `jihad'.

Authorities in Islamabad, however, have so far denied that Kasab belonged to Pakistan. It insists that India has not provided enough proof about the perpetrators of the Mumbai carnage.

Pakistan has stated that Kasab was not caught near the Hotel Taj or the Hotel Oberoi, both of which were attacked by the terrorists.

Rehman Malik, the Advisor on Interior Affairs, has charged India with cooking up the story on Kasab.

He also questioned the authenticity of the letter written by Kasab to the Pakistan High Commission in New Delhi to seek legal aid from the Pakistan Government.

"The language and contents of Kasab''s letter did not match those of a real Pakistani, Malik had claimed then. (ANI)