Uhuru Kenyatta won last week's rerun presidential election in Kenya, which was boycotted by the main opposition group, the election commission has said.

Kenya will hold fresh presidential elections on October 17, the electoral commission has announced.

The Kenyan election commission's database was unsuccessfully targeted by a hacking attempt, a top electoral official has said.

Protesters in the Kenyan city of Kisumu say police are shooting at them and using tear gas amid anger over election results in the stronghold of opposition leader Raila Odinga.