Three US firemen killed by wildfire in Colorado

Three firefighters were killed in Colorado as heat and wind drive an uncontained wildfire along the state's border with Utah.

Blistering heat and strong winds fuel wildfires across the western US, with conditions turning deadly in Colorado.

Tragedy struck Saturday when three firefighters were killed and two others suffer burn injuries.

They were overcome by fast-moving flames that cut off all escape routes, despite deploying emergency shelters.

The National Weather Service warns of "extreme fire behaviour" along the Utah-Colorado border, where rapid fire growth is likely.

The Four Corners region where Arizona, Colorado, New Mexico and Utah intersect remains under critical risk.