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Australia's Civil Aviation Safety Authority said the cracking issue was a serious problem that needed a serious response.

Australian Prime Minister Scott Morrison said the vast scale of the fires required a new response from the bushfire-prone nation.

Avianca has not flown a regularly scheduled passenger flight since late March and most of its 20,000 employees have gone without pay through the crisis.

Authors of the books are all senior researchers and famed scholars at the Chinese Academy of Social Sciences or top Chinese universities.

Authorities should strengthen inspection and maintenance of roads, railways, power and communications lines and work to ensure that public transport not be disrupted by blizzards, the center said.