California’s largest wildfire of the summer has exploded in size, forcing thousands of residents to evacuate fast-moving flames. The Park Fire, north of Sacramento, has scorched more than 160,000 acres and is just 3% contained. It’s one of dozens of active large wildfires burning across the western U.S. and Canada.

In Alberta, Canada, a raging wildfire swept through the Rocky Mountain tourist town of Jasper overnight Wednesday, forcing 25,000 people to flee. Alberta’s Premier Danielle Smith said up to half of Jasper’s structures were damaged or destroyed.

Danielle Smith: “Homes and businesses have been lost to a wildfire that people are calling a wall of flames. There is no denying that this is the worst nightmare for any community. … Right now the wildfire is still out of control, and crews are working in dangerous conditions to try and protect critical infrastructure in the town.”