Kenyan police have fired teargas and water cannon to disperse protesters as thousands took to the streets to mark the one-year anniversary of anti-government demonstrations that left dozens dead.

Youth-led protests against police brutality and poor governance have erupted across Kenya, with thousands gathering in Nairobi.

The police fired tear gas at demonstrators who were expressing anger at the government over growing economic hardship and a lack of accountability for killings at earlier rallies.