The following content is sourced from external partners. The mission also noted the absence of tactile ballots for visually impaired voters.
Nairobi- Kenya slipped a little deeper into violence on Wednesday after the former prime minister Raila Odinga rebuffed the final results of the recent presidential elections.
Mr Odinga has disputed these provisional results, saying in a tweet that his party's own assessment puts him ahead of Mr Kenyatta. He provided no supporting documentation.
Mudavadi's claims echoed similar accusations tabled by Odinga on Wednesday when he described the counting process as a "sham" and said hackers had broken into the tallying systems and interfered with the results.
The opposition's hacking allegations should be looked into by the IEBC, he added. His deputy Kalonzo Musyoka also called for calm but said the opposition might call for unspecified "action" at a later date.
At least two of attackers were killed by police, said Larry Kieng, regional police coordinator.
A senior police officer confirmed two had been killed in the flashpoint Nairobi slum of Mathare.
He too called for peace and calm.
The 72-year-old, who is making his fourth bid for the presidency as the flagbearer for the National Super Alliance (Nasa) coalition, accused his rivals of stealing victory from him through rigging in 2007 and in 2013.
The IEBC said there had been an attempt to hack its system, but it failed. Some stations opened slightly late mainly due to slow preparations by polling officials, especially the failure of the password on some of the BVI devices (KIEMS). These are then scanned and sent to the election board for posting online, a measure created to combat rigging.
The presidential candidates' agents would have "special access" to the forms, though, the electoral commission said.
Once observers have all signed, they are scanned and electronically transmitted to the 290 constituency tallying centers, which collate all the results into Form 34Bs and send it to the electoral commission's national tallying center.
Despite the polls having received high marks from all observer groups in the country, the opposition insist the electronic system had been hacked and results tampered with. That claim echoed one made by Odinga shortly after the voting.
Global election observers however found few irregularities and called the vote credible.
Shortly after they spoke however, one of NASA's leaders Musalia Mudavadi gave a televised press conference unveiling new claims from "confidential sources" within the IEBC saying their servers showed Odinga was the true victor.
With 97 percent of stations totalled, Kenyatta was leading with 54.32 percent of the votes versus Odinga's 44.8 percent, while none of the other six candidates managed more than 0.3 percent of the votes.
"Kenyatta's provisional win will soothe those investors who feared a leftist shift in economic policy", said Hasnain Malik, global head of equities research at Exotix Capital. "Neighbors turned against neighbors, mostly along tribal lines, and I think we're seeing the beginning of that here".