Police fired teargas at rock-throwing protesters after tens of thousands marched through Burkina Faso'scapital calling for President Blaise Compaore, already in power for 27 years, to scrap plans to change term limits to stay in power.
An early morning march on Tuesday through the heart of Ouagadougou was peaceful but clashes erupted later as protesters tried to advance towards the National Assembly.
Tuesday marked the start of a civil disobedience campaign by opposition parties after the government asked the National Assembly to order a referendum on changing the constitution to let Compaore seek re-election next year rather than step down.