Police fired tear gas and water cannon at protesters in Burundi's capital as demonstrations continued against the president's decision to run for a third term, a move critics say violates the constitution.

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A protester carries stones during clashes in the Burundian capital Bujumbura against the decision to allow President Pierre Nkurunziza to run for a third five-year term in officeThomas Mukoya/Reuters
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Riot policemen retreat during clashes with protesters in BujumburaThomas Mukoya/Reuters

At least six people have been killed in clashes between the police and civilians, after President Pierre Nkurunziza said he would run in the 26 June election.

Demonstrators were angered by the decision, saying it is anti-constitutional as the president can only seek two five-year terms according to the Arusha peace agreement. The document was signed in 2000 and intended to pave the way to democracy and end the civil war started in 1993. The conflict, fought between ethnic Hutu and Tutsi, has killed at least 300,000 people.

Nkurunziza has been in power since 2005. His supporters said that his first term should not be considered as he was chosen by the Parliament.

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A riot police officer speaks to Bujumbura residents participating in street protests against the decision to allow President Pierre Nkurunziza to run for a third five-year term in officeThomas Mukoya/Reuters
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A riot police officer sprays tear gas on protesters in the capital BujumburaThomas Mukoya/Reuters
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Protesters throw stones at riot policemen during clashes in Bujumbura, BurundiThomas Mukoya/Reuters
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Riot policemen run during protests in the Burundian capitalThomas Mukoya/Reuters
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Armed policemen, one with a tear-gas canister, patrol the streets in BujumburaLarry Nshimiye/AFP
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A riot policeman escorts an injured protester who was hit during clashes with riot policeThomas Mukoya/Reuters
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Two young protesters sit handcuffed in a pickup truck after being arrested by police during clashes in CibitokeEsdras Ndikumana/AFP

Tensions in Burundi have sent thousands of people fleeing across the border to Rwanda and created fresh turmoil in a region where other presidents, such as Joseph Kabila in the Democratic Republic of Congo, are nearing presidential term limits.