The police posed a total of 37 questions to Dr Mahathir Mohamad, but they were mostly on the Citizens' Declaration, revealed his lawyer Ahmad Bazlan Che Kasim.

Initially, it was reported the police would be recording the former prime minister's statement on his remark that the Yang di-Pertuan Agong and Malay rulers are under house arrest.

"I would say about 80 percent of the questions were related to the Citizen’s Declaration," Ahmad Bazlan told reporters at the Yayasan Albukhary in Kuala Lumpur this afternoon.

He said the police started recording the statement about 3.20pm and the session, which he described as laidback and cordial, ended some 30 minutes later.

Ahmad Bazlan also revealed that the case had been classified under Section 500 of the Penal Code, which is related to defamation.

Following the session, Mahathir left the venue in a silver-coloured Jaguar, followed by a convoy of vehicles, including a police patrol car.

The former prime minister waved at reporters, but did not stop to answer questions.

Meanwhile, Ahmad Bazlan said Mahathir responded to all 37 questions which were posed to him.

"He responded. You got me there," he replied with laughter when quizzed on this.

Another lawyer who was also present, Muhammad Rafique Rashid Ali, said there was no confirmation of any charges against Mahathir.

A police source told Malaysiakini that Mahathir had avoided answering most of the questions, citing that it was his right to do so under the law.

"However, he did answer several of the questions we posed to him," he added.

This is the third time the police have questioned the former prime minister since he launched his campaign against Prime Minister Najib Abdul Razak.

Last week, Malaysian Anti-Corruption Commission (MACC) advisory board chairperson Tunku Abdul Aziz Tunku Ibrahim filed a police report against Mahathir.

Among others, Tunku Aziz claimed that Mahathir’s remark on the royalty was reckless and against the honour and integrity of the prime minister.

Mahathir had made the startling claim during a dialogue session in Subang Jaya.