At least four firefighters have been injured over the last week while battling three wildfires in Northern California forests that are burning amid extreme heat in steep, bone-dry terrain, fire officials said Monday.

With a pump and a sprinkler, one Palisades resident thinks he can help Californians protect their homes from fire. Experts disagree on whether it could work.

Wildfires have scorched hotspots in several Mediterranean countries this month, with blazes forcing thousands of people into lockdown in Catalonia in Spain, and encroaching on France's second-biggest city of Marseille.

More than two hundred firefighters tackled three separate grass fires in east London on Monday evening. Some residents in Dagenham were asked to temporarily leave their homes after eight hectares (20 acres) of grass, shrubland and trees, fences and garden furniture caught alight near Beam Parklands.

Wildfires have flared up again this month, leading to the evacuations of eight communities in northern Saskatchewan. The most recent is the northern hamlet of Patuanak, as well as around Beauval and Montreal Lake Cree Nation.

At least four uncontained wildfires burning across Colorado’s western slope on Sunday, which together have destroyed thousands of acres, prompted Gov. Jared Polis to issue a disaster