Beijing is deploying as many as 10 satellites in hopes of tracking down Malaysia Airlines flight MH370, state media reported Tuesday, as the search for the vanished aircraft entered its fourth day.

The high-resolution satellites, which are controlled from the Xian Satellite Control Centre in northern China, will be used for navigation, weather monitoring, communications and other aspects of the search-and-rescue effort, the People's Liberation Army (PLA) Daily said.

Nearly two-thirds of the 239 people aboard flight MH370 were from China, and if the loss of the aircraft is confirmed, it would be China's second-worst ever air disaster.

Crews from nine countries have joined the international search effort, including China, Malaysia, the United States, Singapore, Vietnam, New Zealand, Indonesia, Australia and Thailand.