Hutu rebels in Burundi have fired mortars and grenades at the capital Bujumbura, killing at least three people, army and rebel officials have said.
The attack by the Forces for National Liberation's (FNL) rebels on the northern and eastern suburbs of Bujumbura came after government troops shot dead four people while scouring an FNL stronghold for rebel fighters on Sunday.
Residents in Kamenge and the eastern suburb of Kiriri said they saw five dead.
The FNL has denounced a deal between the government and another rebel faction aimed at ending the country's 10-year civil war, which has killed 300,000 people. Last week it warned that fresh fighting could break out near Bujumbura at any time.
The war has seen rebels from the Hutu majority fighting to end the traditional political and military dominance of minority Tutsis.
The main Hutu rebel group, the Forces for the Defence of Democracy (FDD), is set to join the government and start taking up army posts in the next three weeks under a peace deal signed in Pretoria earlier this month.
Analysts say that with FDD and the army joining forces, the chances of defeating FNL, the second biggest rebel group, have risen.
Leaders from countries including South Africa, Uganda and Tanzania are expected in the Tanzanian city of Dar es Salaam on Friday to endorse the latest phase of the deal to end the war.