Barisan Nasional did not cheat in the general election, says its Chairman Najib Tun Razak.

Malaysia may renegotiate some deals with China, former prime minister Mahathir Mohamad says, just hours after his coalition secured a stunning election win against the government of Najib Razak.

Mahathir Mohamad brushed aside doubts that he would become Malaysia's next prime minister following his shock election victory over the coalition that has ruled the Southeast Asian nation for six decades since independence from Britain.

An alliance of opposition parties spearheaded by Mahathir Mohamad won Malaysia's general election on Thursday, official results show, setting the veteran strongman on course for a return to the Prime Minister's Office he occupied for 22 years.

Malaysian politicians from both government and opposition camps complains of "dirty tricks" after voting in a general election begins on Wednesday, as non-stop spam calls to their mobile phones disruptes communications with party organisers.

Malaysia's Human Rights Commission says the recent redrawing of electoral boundaries, which opposition parties said favored the ruling coalition, is an "epic breach" of democracy.