(Open): Wall Street markets opened sharply lower, building on the previous session’s losses.
Nerves were unsettled after Thursday’s warning of a slowdown in economic growth from the Federal Reserve.
The Fed also expressed concern about the UK’s possible exit from the European Union.
The tech-heavy Nasdaq lost 38 points to 4,796.87.
Boeing led the losers on the Dow, falling 2.5%.
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