Millions swelter as central and eastern US placed under excessive heat watch

Meteorologists predict scorching temperatures for the weekend before weather cools just in time for Labor Day

Millions of Americans will continue to swelter as Labor Day weekend approaches, with much of the country under some kind of excessive heat watch.

The brutal heatwave the US midwest suffered earlier this week has spread to the eastern half of the country, with more than 20 million people under some kind of a heat alert.