KUALA LUMPUR, March 26 -- Tun Dr Mahathir Mohamad's two sons said they had been ordered to assist the Malaysian Anti-Corruption Commission (MACC) in an anti-graft investigation purportedly targeting the former prime minister.

Tan Sri Mokhzani Mahathir and Mirzan Mahathir claimed that the commission's investigations pointed to their 98-year-old father as the main suspect in the probe.

Speaking to Bloomberg, Mokhzani confirmed that his father is the primary suspect in the MACC investigation.

"We (with Mirzan) are witnesses to whatever it is that they're investigating," he told the business and financial markets media outlet in a report published today.

Both Mokhzani and Mirzan were interviewed via video call here last Saturday.

The rep...