At least 50 people are reported to have died after floods and landslides hit the Burundi capital, Bujumbura.
The BBC’s Cyiriaque Muhawenayo in the city says it is not yet possible to give accurate figures because bodies may be hidden in the mud or under debris.
One man said he had lost nine relatives.
Our correspondent says the main hospital’s morgue is full, and that people are being treated outside.
Water and mud flooding down from hills outside the city have washed away hundreds of houses, according to police.
Yemen is to become a federation of six regions as part of its political transition, state media report.
Final approval was given by a committee chaired by President Abdrabbuh Mansour Hadi following two weeks of talks with delegates from across the country.
The federal structure should be enshrined in a new constitution that must be put to a referendum.
The move is intended to end the complaints against centralisation that fed rebellions in the north and south.
Yemen has also been struggling to deal with the unrest sparked by a 2011 popular uprising that forced long-time President Ali Abdullah Saleh to step down, and an insurgency by Islamist militants allied to al-Qaeda.
Iranian warships in the Atlantic Ocean are to sail close to US maritime borders for the first time, a senior naval commander has said.
Iranian media quoted Adm Afshin Rezayee Haddad as saying the deployment was a response to US vessels in the Gulf.
The fleet consists of a destroyer and a helicopter-carrying supply ship.
It began its voyage last month and entered the Atlantic though South African waters, the IRNA news agency quoted the admiral as saying.
The Iranian ships are reported to be carrying about 30 navy academy cadets for training along with their regular crews. They are on a three-month mission.
Correspondents say that the voyage comes amid continuing efforts by Iran to to project its power across the Middle East and beyond.