Former prime minister Dr Mahathir Mohamad appeared unfazed by the 45-minute police questioning session.

Speaking to reporters later, the 90-year-old Umno veteran laughed when posed with questions.

"They (the police) asked questions. I said I will not answer. I don't censor anything," he said.

On whether the police would take action against him, an unperturbed Mahathir replied: "It's up to them. I don't know."

Mahathir also dismissed the speculation that he might once again quit Umno in his bid to oust Prime Minister Najib Abdul Razak.

"No, that's my party," he responded with a laugh.

The police had questioned the former prime minister at the Yayasan Al-Bukhary building in Kuala Lumpur.