Kenyan police have fired tear gas and water cannons to disperse protesters as thousands took to the streets to mark the first anniversary of anti-government demonstrations that left dozens dead.

Demonstrators joined antigovernment marches across the country a year after huge rallies against a contentious tax plan left more than 60 people dead.

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