Stampede in primary school wounds 20 other students, officials in the country's western town of Kakemega say.
The finance minister, Henry Rotich, has handed himself to the police after the chief prosecutor ordered his arrest on corruption charges related to the construction of two massive dams.
Police said they had arrested nine suspects, in addition to the two arrested on Wednesday, including a man initially thought to have been among the dead attackers.
Witness says two people shot dead as Kenyan police tried to disperse opposition supporters marching for opposition leader Raila Odinga.
The presidential election went ahead despite the failure of a Supreme Court hearing to rule on whether the imminent vote would be fair. Violent clashes between police and the opposition that boycott the vote left at least three dead.
Confusion reigns over upcoming election rerun after opposition leader Odinga refuses to take part, citing lack of electoral reforms. More protests are expected.
A court ruling and a parliamentary vote appeared to ease incumbent President Uhuru Kenyatta's path to a second term, a day after his rival quit an election they were to contest.
Central Kenya has been hit by a wave of violence in recent months as armed cattle-herders searching for dwindling grazing land have driven tens of thousands of cattle onto private farms and ranches.
Kenyan police fire tear gas at opposition leaders and their supporters as they were marching on office of country's electoral body.
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