(Bloomberg) -- U.S. stocks sank the most since June, capping the worst week for benchmark indexes since 2012, as a selloff in developing-nation currencies spurred concern global markets will become more volatile.

Caterpillar, General Electric and Boeing slid at least 2.6% to pace losses in the Dow Jones Industrial Average. Kansas City Southern plunged 15%, the biggest retreat since 2008, after reporting lower-than-estimated earnings. International Game Technology tumbled 15% as the maker of slot machines posted first-quarter profit that missed analysts’ projections.

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