People walk across a bridge strewn with flood debris in western Rwanda on Wednesday, May 3, 2023. Torrential rains caused flooding in western and northern Rwanda, killing more than 100 people, a public broadcaster said Wednesday. RwandaTV via AP
Images posted online by the state broadcaster showed rivers of mud sweeping through the streets as residents scrambled for safety.
"Rescue interventions are ongoing in the most affected districts... in order to secure endangered citizens," the office of President Paul Kagame said in a statement.
"My deepest condolences to the families and loved ones of the victims of the landslides and floods that occurred last night in the Western, Northern and Southern Provinces," Kagame said in a separate statement on Twitter.
"We are doing everything within our means to address this difficult situation. I am personally following up the response closely."
Earlier, the state-run Rwanda Broadcasting Agency (RBA) said 115 people had died in the Western and Northern Provinces and warned that the floodwaters were still rising "causing a threat to more lives".
Most of the deaths occurred in Western Province which borders Lake Kivu, it said, adding that homes and infrastructure had been swept away and roads closed.
"I was at home with my children but we escaped successfully before it collapsed," said Jane Munyemana, a resident in the town of Rubavu in Western Province.
"We plan to remove the floodwaters and sleep in it tonight but we are worried that it may rain again and destroy whatever is remaining," she told AFP.
Other parts of East Africa have been battered by rains and flooding, including Uganda where six people have been reported dead.
"Relief efforts began immediately, including helping to bury victims of the disaster and providing supplies to those whose homes were destroyed," Rwanda's minister in charge of emergency management, Marie Solange Kayisire, told RBA.
She called on local residents to increase patrols, especially at night, so people could be moved to safer ground when it rains heavily.
"When the floods started, there were massive landslides which caused trees to fall and bury the road down here. Our plantations were also washed away. We have a big problem down here," one woman in Northern Province told RBA.
In neighbouring Uganda, six people died in the west of the country when landslides struck their homes after days of torrential rain, according to the local Red Cross.
It said five of the dead belonged to the same family and were from a single village.
Images shared by the Red Cross showed local farmers perched on steeply terraced hillsides digging through the fresh mudslide and homes buried up to their rooftops in mud.
East Africa often suffers from flooding and landslides during the rainy seasons, although several countries in the Horn of Africa have been in the grip of the worst drought in decades.
Experts say extreme weather events are happening with increased frequency and intensity due to climate change -- and Africa, which contributes the least to global warming, is bearing the brunt.
Last month, at least 14 people died after heavy rains triggered floods and landslides in southern Ethiopia, regional police said. Hundreds of livestock perished and scores of houses were damaged.
In May 2020, at least 65 people died in Rwanda as heavy rains pounded the region, while at least 194 deaths were reported in Kenya.
At the end of 2019, at least 265 people died and tens of thousands were displaced during two months of relentless rainfall in several countries in East Africa.
The extreme downpours affected close to two million people and washed away tens of thousands of livestock in Burundi, Djibouti, Ethiopia, Kenya, Somalia, South Sudan, Tanzania and Uganda.