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Datong city in North China's Shanxi province is stepping up efforts to develop its transportation network in a bid to promote tourism to boost local economy.

David Maraniss, an investigative journalist and associate editor, tweeted that "the argument that lives might have been saved had (Woodward) reported this earlier is ahistorical."

Data from Guangxi Liugong Machinery Co showed that the group's excavator production volume in April totaled 4,500, tripling the level of the same period last year.

DJI is the world's largest drone maker, accounting for 70 percent of the global consumer drone market. Its MG series crop protection drones will be adopted for the cooperation. Priced at 42,000 yuan (,163) each, the machines are mainly sold to professional crop protection teams who provide pesticide spraying services to farmers.

Data showed the root causes of 483 accidents were related to drivers, vehicles and enterprises, and 223 accidents were caused by road safety loopholes.