At least 93 people have lost their lives, and more than hundreds are unaccounted for in Germany after the area got hit by some of the worst flooding in decades.
Record rainfall in north-western Europe made rivers burst to banks, shattering the region.
German Chancellor Angela Merkel appealed for an unwavering battle against climate change.
Belgium has also recorded at least 12 dead, while the Netherlands, Luxembourg and Switzerland are also impacted.
In Germany, the states of Rhineland-Palatinate and North Rhine-Westphalia were the most hit.
Scientists have recurrently cautioned that human-induced climate change would lead to pulses of extreme rainfalls such as this one.
Around 1300 people in the western German district of Ahrweiler are unaccounted for, the authorities have stated. A spokeswoman for the local government mentioned mobile networks had been put out of action, making it unmanageable to contact many people.
The village of Schuld, with a population of around 700, has been destroyed. A major dam near the Belgian border, the Rurtalsperre, is overflowing at total capacity, officials mentioned.
In the town of Erfstadt-Blessem, near Cologne, floodwaters instigated a row of houses to collapse. Local authorities mentioned that they were getting emergency calls from people surrounded by floodwater; however, rescue in many cases was not possible.
The authorities state that they are not sure how many people are missing in the Ahr valley. There is no phone signal in most of the region, making communication impossible. It is expected that the death toll will rise today, and with every passing hour, the magnitude of this disaster becomes ever more evident.
All along the river Ahr, there are drowned homes, damaged bridges, the twisted remains of campsites and caravan parks.
Around 15,000 police, soldiers and emergency service workers are deployed in Germany, helping with the search and rescue, while helicopters are picking stranded residents from rooftops and tanks are clearing roads of fallen trees and debris.