The impact area where a medical transportation plane crashed in Philadelphia was notably “expansive,” U.S. Transportation Secretary Sean Duffy said Monday after viewing the site with investigators and city officials. Duffy said he was struck by “how expansive it was. And the issues that fire and police were dealing with. Again, this is a very populated area.” The crash Friday evening killed all six people on the Learjet 55 air ambulance, including a girl who had been receiving medical treatment at Shriners Children’s Philadelphia hospital. A seventh person inside a vehicle was killed on the ground. MORE: https://www.wthr.com/article/news/nation-world/philadelphia-medical-plane-crash-investigation/507-b9ab03d8-441b-405b-8b05-29390bf28e5e