As recovery crews endure cold water and miserable rain Friday to attempt to pull more wreckage of American Airlines Flight 5342 and an Army Black Hawk helicopter from the Potomac River, investigators are intensifying their search for the collision’s cause – with initial concerns already raised about the path of at least one of the aircraft.

A small medical transport plane, carrying a child, her mother and four other people, went down in Philadelphia on Friday, in a fiery crash near a busy mall. The Learjet 55 crashed near the Roosevelt Mall in northeast Philadelphia around 6:30 p.