BEIJING - China is very worried over a Beijing-bound plane that has lost contact with air traffic control, Foreign Minister Wang Yi said Saturday.

China's Ministry of Foreign Affairs has started emergency mechanism and is trying its best to reach more details, said Wang.

There are 158 Chinese passengers on board.

"The news is very disturbing. We hope everyone on the plane is safe," said Wang.

He made the remarks at a press conference on the sidelines of the annual session of the National People's Congress, China's top legislature.

Wang said that China's Foreign Ministry and the related departments have activated emergency response mechanism.

"As soon as we have any more information, we will give it to you immediately," he said.