Stocks slipped Monday morning as investors braced for a busy week of corporate earnings reports.
Oil prices climbed after peace talks between major global powers stalled over the weekend.
The energy sector led gains in early trading, with crude futures rising more than 2%.
Major indices opened lower, with the Dow Jones Industrial Average falling roughly 100 points.
The S&P 500 and Nasdaq also posted modest declines in the first hour of trading.
Traders are now focused on quarterly results from several big technology and industrial companies.
Markets remain sensitive to geopolitical developments that could disrupt energy supplies.
