"It was just like an earthquake," witness Zhang Supong told China Daily.
Construction of the building has been halted pending an investigation of the collapse, including reports that cracks had appeared Friday on a flood prevention bank near the apartment building, Xinhua reported.
Link to story. http://cache.daqi.com/view/2617990.html to pictures. -via J-Walk Blog
I'm guessing the ground subsided, it look very soft there.
That's some kind of engineering! (or photoshopping)