The Department of Energy said Friday low-altitude helicopter flights to measure background radiation will be done over New ...

Investigators are intensifying their search into what caused the collision between American Airlines Flight 5342 and an Army Black Hawk helicopter, with recovery crews still working to pull wreckage ...

The National Investigative Unit tracked the American Airlines plane moments before it collided with an Army Black Hawk ...

Air traffic control audio shortly before the collision captures the helicopter pilot saying, “PAT 2-5 has aircraft in sight, request visual separation.” ...

Under the U.S. Department of Energy, the Leonardo AW-139 helicopter is measuring expected background radiation across the region as part of standard preparation to protect public health and safety ...