The Xi 'an subway construction Office, the department overseeing the project, has called for safety checks at all of its subway construction sites in the city.

西安地铁建设办公室，视察工程部门要求城市所有的地铁站点都需经过安全检查。

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Two deadly collapses in 2008 spurred reforms and even criminal charges, but another crane fell and killed a worker in the city just this past April, at a subway construction site largely exempt from city safety rules.

WSJ: APNewsBreak: Operator cited in NYC crane collapse