The incident took place at about 12:40 PM (local time) yesterday near the entrance of a tunnel on the Fuzhou-Yinchuan Highway in Xi'an city, the capital of Shaanxi.
The police declined to release more details, citing ongoing criminalinvestigation, state-run Xinhua news agency reported.
It is not clear whether it was a terrorist act or carried out by disgruntled individuals.
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