Footage of Tibet floods isn't being shown in China - and we know little about victims there

The dramatic footage was almost impossible to miss. A torrent of water tearing through Gyirong Port, one of the main border crossings between Nepal and Tibet, sweeping away all in its path as hundreds of people fled for their lives.

The scenes, captured by CCTV cameras, quickly spread on social media and onto screens around the world.

Only a single still-frame shot has been broadcast so far by the country's state-run flagship news bulletin.

It has also been difficult to find the video on China's heavily censored internet. It is just as hard to even find posts describing the flash flooding that has claimed hundreds of lives, with just as many still unaccounted for since Wednesday.

Beijing has launched a massive rescue operation involving hundreds of emergency workers, which is continuing, and President Xi Jinping chaired an emergency meeting with officials to co-ordinate efforts.

But when you compare the country's internet content to what much of the world has been seeing online these past few days, China's firewall becomes more visible than ever.

Tibet, which Beijing annexed in the 1950s, had long resisted rule by the Chinese Communist Party.

China has quashed protests over the years, sometimes violently, and has been accused of grave rights violations in the Buddhist region. It has labelled the exiled spiritual leader, the Dalai Lama, a separatist.