Anti-riot police have been deployed in Kenya's capital city, Nairobi, as coalition led by Prime Minister Raila Odinga will move to the Supreme Court on Saturday to officially file an election petition challenging last week's election of Uhuru Kenyatta as the country's fourth president.

Some of the supporters of the Coalition for Reform and Democracy (CORD) were injured as anti-riot police engaged them in running battles in the Nairobi streets.

The supporters wore white T-shirts with several banners declaring support of the petition which was due to be filed at the Supreme Court later on Saturday.

"We don't want chaos in the country. I only came to support the petition that was to be filed by CORD but was taken aback when I saw police throw teargas canisters to disperse us even though we are peaceful," Alfred Baraza told Xinhua on Saturday.

The injured have been rushed to the hospitals but other pro- CORD supporters are still chanting on the streets as they sing the national anthem.

The Supreme Court has been condoned off by anti-police as CORD lawyers made a last ditch efforts to file the petition.

"We will eventually know the truth which will come out of this petition. The police are acting on orders from their seniors who want to keep the status quo. I want to tell them that this is a different Kenya, there is a new constitution in place which allows peaceful assembly and freedom of expression," said Anthony Okello, one of the pro-CORD supporters.

However, the police said their duty was to keep peace by turning away some of the supporters. Lawyers of the civil society organization which is also challenging the election of Kenyatta have submitted their petition to the Supreme Court.

The group, the Africa Center for Open Governance has raised numerous concerns about the vote, including the expulsion of party agents from tallying centers during counting.

The coalition led by Odinga has raised concerns about other alleged irregularities, including irreconcilable numbers coming from polling stations and cases where the number of votes cast in some areas exceeded the number of registered voters.

CORD is also seeking to conduct a full audit of the results as the basis of their case against the declaration of Kenyatta as President.

They requested various primary documents including Forms 34, 35 and 36, statutory documents used to declare results and tallies from elections in various centers.

On Friday, CORD lawyer James Orengo said the evidence has been tightened and will shock Kenyans when they learn the extent of the anomalies that marred the historic general elections which were being closely watched by the international community.

Orengo however said the Independent Electoral and Boundaries Commission (IEBC) was still frustrating efforts to obtain information as directed by the High court on Wednesday.

"We want to assure the public that the petition is ready and all the documents are ready for filing. Our move is purely strategic and has nothing to do with the content of the petition," Orengo said on Friday.

He said the move to delay filing of the petition on Friday to Saturday would allow Kenyans understand the merits of petition and why Cord was disputing the results announced as by the electoral commission last week.

The electoral body last Saturday declared Kenyatta, the son of the country's founding father, president-elect with 50.07 percent of the vote, enough to avoid a run-off against Odinga's 43.28 percent.

The 67-year-old Odinga, who refused to concede defeat, is seeking to have Kenyatta's declaration as President-elect nullified on grounds of anomalies that marred the polling and vote tallying exercises.

CORD is arguing that figures of votes attained by Jubilee Alliance whose flag bearer was Kenyatta were inflated especially in their strongholds while they were denied their votes in CORD strongholds a claim which the IEBC has said is baseless and pointless.

Both local and international poll observers described Kenya's general election as peaceful and credible.

The outgoing PM said every instrument deployed by the electoral body failed and that there was interference with the voter register following failure of the electronic voter identification kit.