Excessive heat scorches millions across US southwest

An unrelenting heatwave is scorching south-western parts of the US with Arizona projected to see a record stretch of extreme hot weather.

More than 115 million people are under some form of heat warnings, the National Weather Service (NWS) said.

Phoenix has experienced 14 days of temperatures of at least 43C (110F) and is forecast to surpass its 18-day record of over 43C heat next Tuesday.

Many other cities are expected to soar above 100F (38C).

In a warning issued on Thursday, the NWS said the heatwave will also hit states like Nevada, Oklahoma, Texas and California.

It expects "oppressive heat" of up to 115F (46C) in some parts of the Southern Plains.