The cause of the two crashes has not yet been determined. Boeing said a malfunctioning sensor may be the cause of the crashes. Dennis Muilenburg, Boeing's CEO, said: "It's our responsibility to eliminate this risk. We own it, and we know how to do it."
The bus driver, a 40-year-old male from Staten Island, a borough of New York City (NYC), was not injured in the crash.
The bone tools, six made of broken long limb bones from herbivores and one made of antler, were discovered in a Paleolithic site in Xuchang city in Central China's Henan province.
The campaign has been carried out nationwide since May 31.
The blast occurred at around 6:30 p.m. on Thursday at a chemical plant Hengda in an industrial park in Jiang'an County, Yibin City, according to the provincial work safety administration.
The bus departed the China-Vietnam border county of Dongxing and was heading to the regional capital Nanning, about two hours away. It carried 27 people.
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The cause of the fire was not immediately known.
The center covers various aircraft completion activities, including cabin installation, aircraft painting and production flight test, as well as customer flight acceptance and aircraft delivery.
The building first captured people's attention on Douyin, a short video streaming app. In the six-second video, the building looks mythical with a blue sky background, and some people jokingly said it was burning because of the hot weather in Xi'an.
The bookshop's business success has injected new life into the neglected mountain community. Several cultural enterprises followed its lead and set up businesses on the mountain, which has now been developed into a cultural landmark.