Over 100m Americans under heat warnings as wildfires rage in 12 states

Blazes have scorched over 3m acres as temperatures expected to reach 100F in much of the Plains and Mississippi Valley

More than 100 million Americans are under either a heat warning about dangerous conditions or heat advisories amid record temperatures, as 85 major wildfires burn in 13 US states, scorching more than 3m acres.

Officials said on Tuesday that 14 new large fires were reported: seven in Texas, two in Alaska and two in Washington, as well as one each in Arizona, California and Idaho.