Philadelphia Mayor Cherelle Parker and other city officials are providing an update on the crash response and investigation.

Philadelphia Mayor Cherelle Parker and other city officials are providing an update on the crash response and investigation.

Investigators are on the scene again today, searching for the black box and other evidence to provide clues about how the tragedy occurred.

The plane took off, reached about 1,500 feet of altitude and then plummeted in a steep descent, crashing less than a minute ...