Construction Thmaterial News Today

>> reporter: dozens of firefighters on the scene desperately pulling out bricks and debris. three have been removed from the rubble. >> two of them are life threatening. >> reporter: in 2013, a crane collapsed and killing one and injures two others. an investigation found it was caused by operator error. david, tonight in this incident, we know that the workers were loading construction thmaterial on the roof when it collapsed underneath them. no doubt an investigation is under way. david? >> al...