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"CAAC has reaffirmed the regulation following the recent consecutive aircraft incidents in which passengers and cabin crew have been harmed when delivering services within 30 minutes before landing," Gu Xiaohong said.

"China and the Philippines have reached consensus on the joint development of oil and gas resources in the South China Sea and have established a cooperation mechanism for relevant consultations," Zhao said at a daily news briefing.

"China and the United States are the two largest economies in the world … managing their relations effectively, instead of pointing fingers and exerting pressure on one another, is of great concern to everyone," he said.

"China has vast grasslands along its border," said Yu Guangjun, director of the institute of economics at the Inner Mongolia Academy of Social Sciences. "These have been vital to curb the trend."

"By invoking emergency powers not used for 50 years, the authorities have turned the international focus back on Hong Kong," she said.