Fire was the primary cause of the collapse of World Trade Center Building 7 in New York City, according to a federal agency.

David Childs, the lead architect of the One World Trade Center skyscraper that rose from the site where the Twin Towers collapsed in New York City during the 9/11 attacks, has died. He was 83.

David Childs, lead architect of the skyscraper that rose from the site where the Twin Towers collapsed in New York City during the 9/11 attacks, has died.