The stock market’s response to U.S. strikes on three Iranian nuclear sites was muted at the open on Monday.

The Dow Jones Industrial Average was down 36 points, or 0.1%. The S&P 500 was flat. The Nasdaq Composite was down 0.1%.

Brent crude oil futures rose 0.4% to $77.30 a barrel. Oil prices had already spiked in recent sessions as Wall Street weighed the possibility of an escalation of the conflict in the Middle East. Oil was trading around $62 a barrel at the start of June.