It was an on-ground hot test of engine, instead of "launch" -- unplanned or otherwise.

Nice collection of footage, good info. Thanks

Accidents happen. NASA and Space-X have their own series of accidents too from the distant Space Shuttle Challenger disaster in 1986 to the recent helium leak of the Boeing CST-100 Starliner spacecraft as they neared the International Space Station (ISS). Two NASA-trained astronauts Suni Williams and Butch Wilmore are currently trapped aboard the ISS. I am sure heads will roll in the Chinese Space Agency for this oversight just as heads rolled after the 1986 disaster. Having said, that, life will go on and China will go on to become a major space power just like the US, Russia & India.

This is a small mistake comparing to the nonsense boeing is facing now. The entire plan was testing the engine on the ground and recklessness took place the rocket launched; they had to remotely cut off the engine.

Test, not launch.