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A section of a subway station under construction in Xi'an caved in yesterday morning, killing two workers. An investigation of the accident is underway, but workers at the site said rain in previous days may be to blame for the tragedy. City authorities had called for a safety check along the entire subway line. [Asianewsphoto]

A section of a subway station under construction in Xi'an caved in yesterday morning, killing two workers. An investigation of the accident is underway, but workers at the site said rain in previous days may be to blame for the tragedy. City authorities had called for a safety check along the entire subway line. [Asianewsphoto]