At least 100 people have died in devastating floods across parts of western Germany and Belgium, officials said Friday, as rescue operations and the search for hundreds still unaccounted for continued.

Authorities in the German state of Rhineland-Palatinate said 50 people had died there, including at least nine residents of an assisted living facility for people with disabilities. In neighboring North Rhine-Westphalia state officials put the death toll at 43, but warned that the figure could rise further.

Rescuers were rushing Friday to help people trapped in their homes in the town of Erftstadt, southwest of Cologne. Regional authorities said several people had died after their houses collapsed due to subsidence, and aerial pictures showed what appeared to be a massive sinkhole.

“We managed to get 50 people out of their houses last night,” said Frank Rock, the head of the county administration. “We know of 15 people who still need to be rescued.”

Speaking to German broadcaster n-tv, Rock said that authorities had no precise number yet for how many had died. “One has to assume that under the circumstances some people didn’t manage to escape,” he said.

Authorities said late Thursday that about 1,300 people in Germany were still listed missing, but cautioned that the high figure could be due to duplication of data and difficulties reaching people because of disrupted roads and phone connections.

In a provisional tally, the Belgian death toll rose to 12, with 5 people still missing, local authorities and media report early Friday.

The flash floods this week followed days of heavy rainfall which turned streams and streets into raging torrents that swept away cars and caused houses to collapse across the region.

Chancellor Angela Merkel and U.S. President Joe Biden expressed their sorrow over the loss of life during a news conference at the White House late Thursday.

The long-time German leader, who was on a farewell trip to Washington, said she feared that “the full extent of this tragedy will only be seen in the coming days.”

The governor of North Rhine-Westphalia state, Armin Laschet, has called an emergency Cabinet meeting Friday. The 60-year-old’s handling of the flood disaster is widely seen as a test for his ambitions to succeed Merkel as chancellor in Germany’s national election on Sept. 26.

Officials have warned such disasters could become more common due to climate change.

Meanwhile, sustained rainfall in Switzerland has caused several rivers and lakes to break their banks. Public broadcaster SRF reported that a flash flood swept away cars, flooded basements and destroyed small bridges in the northern villages of Schleitheim und Beggingen late Thursday.

(With AP inputs)