XI'AN, Oct. 21 -- At least four people were killed in a pileup in northwest China's Shaanxi Province early on Tuesday morning.
The accident happened at around 3 a.m. when more than 20 trucks carrying coal collided in fog on the Sanyuan and Tongchuan section of the expressway from Xi'an to Yan'an City, according to local firefighters.
The cause of the accident is under investigation.
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