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Parts of the US are expected to see record temperatures on Sunday, with warnings of "dangerous" heat levels into next week across the south-west.

Nearly a third of Americans - about 113 million people - are currently under heat advisories, from Florida to California and up to Washington state. The country's National Weather Service (NWS) has urged people not to underestimate the risk to life.

On Saturday, an all-time high of 118F (48C) was recorded in Phoenix, Arizona. It means temperatures have hit 110F (43C) for 16 days running, itself almost a rerecor Mobile clinics there have reported treating homeless people suffering from third-degree burns.

Meanwhile, Death Valley in California - one of the hottest places in the world - is forecast to reach 129F (54C), nearing the hottest temperatures ever reliably recorded on Earth.

The NWS has said that local records could also be set on Sunday in the San Joaquin Valley, Mojave Desert, and Great Basin regions.

Its Saturday-evening update said the temperatures would "pose a health risk and are potentially deadly to anyone without effective cooling and/or adequate hydration".

About 700 people are estimated to die each year from heat-related causes in the US, according to the Centers for Disease Control and Prevention (CDC).