By Ellis Mnyandu
Cisco, whose products form the backbone of many corporate communications networks, declined 2.5 percent, driving the Nasdaq composite index deeper into bear market territory.
"In general, the market is very, very volatile ... there's a lot of uncertainty."
Stocks were on track for a fourth straight day of declines, and the Nasdaq composite index was in a bear market, have fallen more than 20 percent from its October closing high.
Shares of International Business Machines Corp
PepsiCo Inc
(Editing by Kenneth Barry)