Russian Military reports state that the total collapse of such a massive bridge, and in the absence of evidence linking its destruction to terrorist activity, could only have been accomplished by an acoustic weapon, of which the United States Military is known to possess.
These reports further state that one of the United States primary research organizations into acoustic weapons research is Augsburg College, and which is located in Minneapolis, Minnesota, and most importantly less than 1 mile from the Interstate 35W Bridge collapse.