KUALA LUMPUR, April 28 -- Two of Tun Dr Mahathir Mohamad's sons said they are not being investigated by the Malaysian Anti-Corruption Commission (MACC).

Tan Sri Mokhzani Mahathir and Mirzan Mahathir said they were only served a notice to assist the probe against their father.

"We understand the whole exercise is to determine if our father Tun Dr Mahathir Mohamad abused his position as prime minister to enrich us," they said in a joint statement issued yesterday.

"We are keen to disprove these accusations and want to prove that whatever we have earned over the years are through legitimate means, through proper channels and without any crime being committed.

"We are appreciative of the extension given to us by the MACC on the declaratio...