An "electronic ping" was picked up from the Malaysia Airlines flight by satellites after the plane lost contact with ground control, Reuters reports. Meanwhile, US officials have been given an "indication" the plane crashed into the Indian Ocean.
China's civil aviation chief said today that there is no proof that floating objects detected in the South China Sea by satellite images are connected to a missing Malaysia Airlines aircraft.
"Chinese satellites have found smoke and floating objects ... At present we cannot confirm this is related to the missing aircraft," Li Jiaxiang told reporters on the sidelines of China's annual meeting of parliament.
He added that there was also no evidence the Malaysian military was concealing information about the missing flight.
A mother has described her frustration as she waits for answers on the fate of her missing son who is on board the missing Malaysia plane.
Malaysia's military believes a jetliner missing for almost four days turned and flew hundreds of kilometres to the west.
The wife of a passenger travelling on the missing Malaysia Airlines flight has spoken of her struggle to cope as she waits for news.