By Nicoco Chan and Tingshu Wang

GYIRONG, China, Sept 6 (Reuters) - About 20 Chinese rescue workers ‌in bright orange worked excavators, shovels and radar ‌detectors on Sunday in an effort to find hundreds of ​people missing since a tsunami-like mudslide wiped out China's main border crossing with Nepal.

The Gyirong border crossing separating China's Tibet and Nepal became a grisly emblem of ‌the devastation that ⁠followed the collapse of a glacier on the Nepal side of the border on ⁠August 26.

Reuters and other news agencies visited the land port, which sits in a narrow river gorge, ​on Sunday ​in a trip organized ​by China's foreign ministry.

There ‌was no trace of the five-storey Chinese customs building that had stood at the border before the disaster, video and pictures from the scene showed. The only structure still visible from before the mudslide was ‌a portion of a nearby ​water tower installation.

Workers had placed ​a Chinese flag ​at the spot where the border gate, ‌at nearly 20-meters-tall, once stood.

Behind ​hazard signs ​that read "Danger Area Pass Quickly", three groups of about 20 rescue and recovery workers dug the ​earth using ‌shovels while several excavators stood by on Sunday ​afternoon.

(Writing by Mei Mei Chu and Kevin Krolicki; ​Editing by Saad Sayeed)