Multiple choice general knowledge history Fire broke out on the 11th floor of the North Tower.In which year? 1970 1971 1973 1975 Reveal answer Fill a bubble to check yourself D Correct answer Explanation A significant fire occurred on the 11th floor of the North Tower in 1975, just a few years after the building's completion. It was one of the most serious high-rise fires of its time and led to improved safety regulations.