A airplane and military helicopter collided in Washington, D.C., before plunging into the Potomac River. Here's who was on board, flight path and more.

These are courtesy translations of local news provided by the U.S. Army Garrison Poland Public Affairs team for the benefit the ...

That's the same flight path that that plane and helicopter crashed last night on. Now, many have been wondering how did all ...

The American Airlines plane operating as American Eagle Flight 5342 collided with an Army Black Hawk helicopter near Reagan National Airport.

A regional jet collided with an Army Black Hawk helicopter near Ronald Reagan Washington National Airport on Wednesday evening, U.S. officials confirmed to ABC News.

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Mapping fish migration routes and identifying threats is crucial to protecting freshwater species and their habitats, ecologists argue.

The Ogallala aquifer that sustains parts of western Kansas has been declining rapidly, and some farmers say the solution is ...