The S&P 500 fell 0.6% and was on track for its first loss this week. The Dow was down 380 points, or 0.8%, as of 12:55 pm ET.

The moves come after the S&P 500 notched its third losing week in a row and closed at its lowest level of the year on Friday.

The S&P 500 fell 0.6% and was on track for its first loss this week. The Dow was down 380 points, or 0.8%, as of 12:55 pm ET.