Here's the link:
http://articles.cnn.com/2003-10-30/us/garage.collapse_1_michael-schurman-aztar-corp-collapse?_s=PM:US

In a hurry to speed up construction ... concrete forms are being removed before the concrete has proper time to cure. Don't know why this happens with casino consturction when there are thousands and thousands of other construction sites where pouring concrete does not result in these tragedies.