Energy stocks lead Wall Street higher
(Close): US markets were mostly higher on Tuesday as the price of oil climbed above $50, boosting energy shares.
The tech-focused Nasdaq sank 6.9 points to 4,961.7 as shares of two major biotech companies fell.
Disruptions to crude supplies in Nigeria lifted oil prices.
Elsewhere shares in Valeant Pharmaceuticals dived 14.6% after the company reported a first-quarter loss and also cut its full-year profit guidance.
Shares in fashion brand Ralph Lauren fell 2.4% after it announced restructuring plans aimed at saving $180m to $220m a year.
The company also projected lower net sales for 2017. In a note Credit Suisse said Ralph Lauren's outlook suggested that profits would remain weak until the 2018 financial year.