China is investigating the cause of an anomaly which resulted in the failure of its second Long March 5 launch on Sunday.
Video from the live broadcast showed the rocket shooting into the sky, with a voice-over indicating everything was going well.
Something happened after separation of the four boosters, as the live launch coverage was abruptly stopped by Chinese media.
Weighing 7.5 tonnes, Shijian-18 is the heaviest satellite China has launched into space.
China has scheduled eight launches of the Long March-5 in the coming years for the nation's lunar probe, manned space station and Mars probe missions.
In a major embarrassment, China's second heavy-lift carrier rocket launch has failed. A Long March 3B rocket launched the Chinasat-9A satellite into geostationary transfer orbit June 19. Details of the failure were not immediately available. It was dubbed "Chubby 5" for its huge size - five metres in diameter and 57 metres tall and was created to deposit payload into low orbit, with a weight which more than doubled the country's previous lift capability.
It said the satellite will operate on geosynchronous orbit and provide communications services over China´s territory - boosting internet access and providing access to more television channels.
WASHINGTON • An American warship yesterday sailed by a disputed island in the South China Sea occupied by Beijing as part of an operation to demonstrate freedom of navigation in the waters, a United States official said.
Last year, Long March-5 had successfully made its maiden flight in Wenchang. One of the key features of this heavy weight rocket is that it uses environmentally friendly fuel, including kerosene, liquid hydrogen, and liquid oxygen, rather than highly toxic propellants.