Zimbabwe's incumbent president Robert Mugabe, 89, won the presidential race Saturday for the sixth time, extending his 33-year rule of the country since its independence in 1980.

The veteran president won 2.11 million votes, or 61.09 percent from about 3.48 million registered voters in the July 31 elections, the Zimbabwe Electoral Commission (ZEC) chairperson Rita Makarau announced.

Morgan Tsvangirai, Mugabe's most formidable opponent, won 1.172 million votes or 33.69 percent of the votes, according to Makarau. Zimbabwe law provides that a candidate with more than 50 percent plus one vote be declared winner of the presidential election.

Zimbabweans went to polls on Wednesday to elect a president, 210 lawmakers, and nearly 2,000 local councilors.

As the newly adopted constitution stipulates that president of the southern African nation can only rule for a maximum two five- year terms, it is possible for Mugabe to be president for another 10 years until he turns 99.

As to parliament election, Mugabe's Zanu-PF party scored 160 seats, accounting for 76 percent of the 210 seats, more than the two-thirds requirement to mend the constitution without consulting the opposition.

Defense Minister Emmerson Mnangagwa, a senior member of Mugabe' s Zimbabwe African National Union-Patriotic Front (Zanu-PF), said that the vote is free, fair, peaceful, and credible and reflects the will of most Zimbabweans.

"It was a fantastic victory with a crashing victory over the opposition parties. We demonstrated that we still have the support of the people," Zanu-PF's national spokesman Rugare Gumbo told Xinhua in an exclusive interview after the results were announced.

"We will look at various promises that we have made and make sure that these things are done," he said.

Regarded as Mugabe's most serious challenger in politics since 1997, Tsvangirai refused to accept the results, declaring on Saturday afternoon that he and his MDC-T party will exhaust all legal remedies to challenge the results.

Tsvangirai, the prime minister of the Zimbabwe coalition government, said at a press briefing at his Harare home that his party will go to court and present evidence on why they are rejecting the elections which he said were "fraudulent".

He said that his party will not join government institutions under Mugabe and Zanu-PF rule.

On participation in parliament, he said that they will decide at the right time.

Police on Saturday warned politicians to desist from inciting lawlessness intended to cause chaos after Tsvangirai said that street protest remains an option for his party and supporters.

"We want to warn politicians that are considering this option of inciting Zimbabweans into mass protest that it is not good for the country. Politicians should not blame the police when they find themselves on the wrong side of the law," said Chief police spokesperson Senior Assistant Commissioner Charity Charamba.

Harare on Saturday is largely quite as residents go to work as usual.

Mugabe said earlier that he has complied with the electoral law.

"I have the law in my country. It is the law that manipulates us all. I don't control the electoral process. I comply with and obey the electoral law," Mugabe told a press conference on the eve of the elections.

The African Union (AU) has endorsed the polls as free and fair whiles the Southern African Development Community (SADC), which brokered the coalition government following political violence in 2009, has cautiously approved the polls, restricting itself to acknowledging just the peaceful and freeness of the vote.

The SADC mission said it will explain the issue of fairness in its final report due within 30 days after announcement of election results.

Head of Chinese Observer Mission Liu Guijin on Friday also endorsed Zimbabwe's polls as fairly credible, free and peaceful, urging political parties to accept results peacefully.

"Though it's not a flawless election, it was generally free, peaceful and fairly credible," he said during a press briefing.