Four of the 24 people injured after the Northeast Philadelphia plane crash remain hospitalized Two are now stable, and two remain in critical condition.

A fatal medical jet crash in northeast Philadelphia killed seven people and injured at least 2 dozen more, and the American Airlines plane/helicopter collision in Washington D.C. remain under investigation.

The impact area where a medical plane crashed in Philadelphia was notably “expansive,” U.S. Transportation Secretary Sean Duffy said Monday after viewing the site.