ISLAMABAD Adviser to Prime Minister on Interior Rehman Malik said on Tuesday that action will be taken against any person accused of being involved in the Mumbai attacks if India provided credible evidence against them.

Malik said India has not provided any official information to Pakistan on the arrest of any Pakistani national and it has also not shared any intelligence reports on the Mumbai attacks.

The PM's adviser told reporters that the foreign office has received a letter from Ajmal Kasab, wherein he has reportedly sought legal assistance.

'The letter is being examined by experts and the foreign office will issue a report regarding the contents of the letter,' he said.

India has claimed that the lone surviving attacker, Ajmal Kasab, is a Pakistani national but Malik refuted such claims.

'We have checked all records with NADRA (National database and registration authority) and have found no information on any person called Ajmal Kasab,' Malik said.

Malik added that the whole nation is united and that the government will 'take any step to safeguard national interest.'