One of the arguments that government apologists have used in trying to prop up the official story of why the World Trade Centers came down on 9/11 is that no structural engineers have questioned the government's version of events. However, that is now changing.The following structural engineers have now publicly challenged the government's account of the destruction of the Trade Centers on 9/11: A prominent engineer with 55 years experience, in charge of the design of hundreds of major building projects including high rise offices, former member of the California Seismic Safety Commission and former member of the National Institute of Sciences Building Safety Council (Marx Ayres) believes that the World Trade Centers were brought down by controlled demolition (see also this

Two professors of structural engineering at a prestigious Swiss university (Dr. Joerg Schneider and Dr. Hugo Bachmann) said that, on 9/11, World Trade Center 7 was brought down by controlled demolition (translation here)