President Pierre Nkurunziza's bid to win a third term "seriously undermines Burundi's stability" and violates the Arusha Agreement that brought its 13-year civil war to an end, the U.S. said late Monday.

"Any violation of Arusha seriously undermines Burundi's stability," the statement issued by the U.S. embassy in Bujumbura said.

At least 10 people have died in heavy floods in Tanzania's commercial capital of Dar es Salaam, officials said Sunday.

The city's regional commissioner, Said Mecky Sadick, said the toll may rise with roads damaged and several bridges swept away.

Tanzanian police said Saturday they have arrested five people in possession of explosives in the economic capital Dar es Salaam.

"Five people were arrested the day before yesterday (Thursday) in possession of explosives after a tip-off from patriotic citizens," Dar es Salaam's police chief Suleiman Kova told AFP.

Rescuers have pulled more bodies from the rubble of a building that collapsed in Tanzania's economic capital Dar es Salaam, bringing the toll to 34 three days after the crash, a local government official said on Monday.

"Ten bodies were found between Sunday afternoon and dawn today. This brings the total number confirmed dead to 34," Dar es Salaam Regional Commissioner Saidi Mecky Sadicky told Agence France Presse.

More bodies, including those of two children, have been pulled out of the rubble of the building that collapsed in Dar es Salaam, bringing the toll to 17, a local government official said Saturday.

"So far the number of people who are dead is 17. This includes two children," regional commissioner Saidi Mecky Sadicky told Agence France Presse.

Dozens of people were feared trapped after a building under construction collapsed in Tanzania's economic capital of Dar es Salaam Friday, according to witnesses.

"I thought there was an earthquake and then I heard screaming. The whole building fell on itself," eyewitness Musa Mohamed told Agence France Presse.