Forecasters are warning about the second day of scorching, dangerous heat which will stretch across the South and the Midwest, where the heat index on Monday climbed as high as 120 degrees in one town.
Observers suspect an explosion that killed five scientists in a recent weapons test involved a nuclear-powered weapon, a missile capable of delivering warheads at long range and high speeds.
The United States is delaying tariffs on Chinese-made cellphones, laptop computers and other items and removing other Chinese imports from its target list altogether in a move that triggered a rally on Wall Street.