World shares mostly advanced Friday, helped by buying of technology-related shares, while oil prices slipped as traders watched for developments in the Iran war.

Tensions between Iran and the U.S. have escalated after President Donald Trump said the Iran war ceasefire agreement was “over” and as the United States and Iran exchanged attacks.

In early European trading, Britain’s FTSE 100 edged up 0.1% to 10,478.98. France’s CAC 40 slipped 0.1% to 8,322.31, while Germany’s DAX also gave up 0.1% to 25,082.58.

The future for the S&P 500 edged 0.1% lower while that for the Dow Jones Industrial Average gained 0.1%.

In Asian trading, South Korea’s Kospi gained 2.5% to 7,475.94, recovering some of its losses from earlier in the week. Shares in memory chipmaker SK Hynix, whose debut on the Nasdaq in New York is set for Friday, fell 0.3% in Seoul.