The streets of the capital Bujumbura were calm and quiet, with some shops open and a few policemen sitting casually at junctions and roundabouts - a marked difference to protests that have left over 20 people dead since the crisis erupted in late April, and which has included a failed coup.
Late yesterday, attackers hurled two grenades into a crowd at a central market in Burundi's capital, killing three people and wounding 40.
Police said they were questioning a suspect, but linked the attack to the protest movement.
"Clearly it is one of a series of acts of violence carried out by the demonstrators," police spokesman Pierre Nkurikiye said.
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Civil society leader Pacifique Nininahazwe announced a weekend truce "to allow the people to bury with dignity those who died for democracy," but added a warning that "protests will resume on Monday with even more force."
"We ask the government to show good faith by refraining to shoot protesters," Nininahazwe added.
"On our part, we promise a completely peaceful demonstration. If they continue to shoot, we will end the dialogue process."
The discreet negotiations have been supported by UN, African Union and regional nations.
UN chief Ban Ki-moon said yesterday he was encouraged by this "political dialogue."
The crisis, which began in late April after the ruling party nominated Nkurunziza to stand again in the June 26 presidential election, deepened last week when a top general staged a failed coup attempt.
Protesters torched election materials in two separate attacks south of the capital yesterday, electoral commission spokesman Prosper Ntahorwmiye said, destroying voting booths and ballot boxes. "Everything was burned," Ntahorwmiye said.
Nkurunziza said in an address to the nation on Wednesday that most of the central African country was secure and that upcoming parliamentary and presidential votes would be peaceful.