The US Forest Service announced that three firefighters died and two crew members were injured while fighting the Knowles and Gore fires on the Utah-Colorado border.
The agency, which was established earlier this year to accelerate firefighting on public lands, said in a statement that it was "deeply saddened" and would support the families left behind. It also stated that more details about the incident would be shared soon.
The fire season across the US is proving to be severe. According to officials, approximately 3 million acres (1.2 million hectares) have burned since the beginning of the year, a figure above the 10-year average. As of Sunday, at least 36 fires across the country remain "uncontained."
Utah Governor Spencer Cox banned the use of fireworks in the state ahead of the July 4 Independence Day holiday. In a post on social media, Cox said, "Today, we mourn three heroes who made the ultimate sacrifice to protect communities and lives on the Utah-Colorado border."
Colorado Governor Jared Polis declared a state of emergency on Saturday, authorizing the deployment of the National Guard to fight the fires. The Utah state administration also warned that persistent drought and dry conditions create an "above-normal fire potential."
Arizona has also been severely affected by the fires. As flames continue south of the Grand Canyon and near Kendrick Mountain, the local electric company implemented a safety power outage on Saturday to reduce fire risk, leaving parts of northern Arizona without electricity.
The US National Oceanic and Atmospheric Administration (NOAA) states that climate change has increased the likelihood of wildfires in recent years due to high temperatures, prolonged droughts, and dry conditions. As fires continue in the west, the record heat wave affecting Europe is expected to reach the eastern US on Wednesday.