The action in stocks on Thursday showed just how quickly simmering concerns in one corner of the market can boil over into a large-scale rout.

Most markets in Asia were in negative territory, with Australia leading losses.

"If your kids get the joke aimed at the adults the problem is you, not the show," shared one social-media commenter.

Beijing urged the U.S. and Russia to act soon, saying the global nuclear order was on the line.

A sheriff said a car was processed as part of standard practices as officials continue investigating Nancy Guthrie’s disappearance.