A tiny cactus that survives intense wildfire could offer clues about the resilience of ecosystems on the Colorado Plateau.

A week after the deadly Grand Canyon flooding, crews continue the search for a missing hiker as the park begins the long process of recovery.

President Donald Trump has signed an executive order directing his administration to begin the process to remove the Mexican gray wolf from the federal endangered species list.

Two Flagstaff residents had front-row seats — from the river and the trail — to deadly flash flooding that surged through Grand Canyon National Park.

The U.S. Forest Service is closing 23 research stations in more than a dozen states as part of an overhaul under President Donald Trump. The Flagstaff Forestry Sciences Laboratory is not impacted.

The South Kaibab Trail is now closed below the Tip-Off, a landmark and resting area, and the Bright Angel Trail is off limits to visitors below the intersection with the Tonto Trail.

Plus: donkeys, maps, art, iPhones and more!

After 9/11, thousands of rescue and cleanup crews went to work at ground zero. They were exposed to toxic debris and experienced psychological trauma. Today, many say they live in fear of deportation.

The U.S. marks the 25th anniversary of 9/11. Events will honor those lost, at a time when Americans are divided about the meaning and legacy of the terrorist attacks.

For decades, the U.S. and Canadian auto supply chains have been tightly woven together. The trade war is threatening to unravel a complex system.

The two day Republican convention in Dallas showcased the party's biggest asset in trying to win competitive midterm races and its greatest obstacle: President Trump.