The northern snakehead fish, now known as the Chesapeake channa, has long been established in the Chesapeake Bay.

A National Oceanic and Atmospheric Administration plane used a green laser Saturday to search the Potomac River for helicopter parts amid the investigation into the Jan. 29 collision. The NOAA ...

Ten days after a passenger jet and a Black Hawk helicopter collided over the Potomac River near Washington, D.C., killing all 67 people on board, investigators have recovered most of the debris ...