The Nepal Floods - what was the cause?

https://www.scientificamerican.com/article/why-glacial-collapse-likely-caused-the-nepal-disaster-and-why-climate-change-will-make-these-events-more-likely/

What caused the Nepal disaster—and why climate change could make these events more likely

The mountain in question is Langtang Lirung, part of the Himalayas. This mountain, which is the 99th highest in the world, is nestled in the Langtang Valley, colloquially known as the “Valley of Glaciers.” Material from Langtang Lirung likely fell into the Lende Khola river on the border of Nepal and Tibet. Altogether, the event affected rivers more than 100 kilometers (62 miles) away, according to Reuters.