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As investigators tried to determine the cause of a bus crash that killed 36 people when the vehicle struck the mouth of an expressway tunnel in Northwest China's Shaanxi province on Thursday, an engineering expert has questioned whether the tunnel design might have posed a hazard.

As of Monday, the Communist Party of China had received more than 1,340 congratulatory telegrams and letters from more than 450 major political parties in 165 countries on the occasion of the 19th CPC National Congress, a senior Party official said on Wednesday.

As of Wednesday, 106 international flights carrying 24,651 passengers bound for Beijing have been diverted to 12 designated airports, Ma Bing, chief of the operation monitoring center under the Civil Aviation Administration of China, said on Thursday.

As per the party charter, a candidate wins the election with more than half the votes; otherwise, the top two candidates contest a second round.

As many as 42 wells have been drilled in the oilfield in the past two years. According to the company, the Kenli 6-1 oilfield has large oil reserves of high quality and an oil-bearing area of more than 100 square kilometers, sufficient to provide fuel for one million vehicles for 20 years, it said.