At least seven people were injured in the clashes at the headquarters of the former ruling African Party for the Independence of Guinea and Cape Verde on Friday.
Police used tear gas and batons to disperse activists from the delegation, the historic group that led Guinea-Bissau, a former Portuguese colony, to independence in 1974.
The party had planned to hold a congress from Saturday to Tuesday but a faction led by one of its leaders, Bolom Conté was not in terms with other part leaders.
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