European stock markets opened lower Tuesday as concerns over the spike in oil prices continued to weigh on markets. Asian stocks had also weakened overnight, after the U.S. reportedly shared intelligence with Saudi Arabia showing that Iran was responsible for the weekend attack on its oil facilities. Saudi Arabia hasn't yet joined the U.S. in publicly blaming Iran, something that could raise the likelihood of a coordinated response against the Islamic Republic.

STOXX 600 -0.2% at 388.92 by 3:08 AM ET (0708 GMT)
DAX, FTSE 100 both open down 0.1%
Zalando (DE:ZALG) -9.3% after strategic shareholder Kinnevik sells down stake
Ocado (LON:OCDO)-0.5% after reporting sales up 11.5% in 13 weeks to Sept. 1, in line with its own forecasts.
Brent futures at $68.41 a barrel, down 0.9% vs late Monday