Spain's IBEX 35 stock index opened lower on Friday, in a market unsettled by the absence of economic stimulus measures in Asia, while market speculation about the direction of interest rates in the United States continues.

This week's Communist Party plenary session offered no new measures to help the economy, disappointing investors and triggering a sell-off in Asian stock markets.

Also inviting optimism were comments from Federal Reserve Bank of San Francisco President Mary Daly, who said Thursday that she needed more signs that inflation is returning to the 2% target before she would favor monetary easing.

Elsewhere, numerous companies - including airports and stock information platforms - were suffering from an IT incident that paralyzed activity in several sectors.

On the Spanish stock market, at 0705 GMT on Friday, the selective Spanish stock market IBEX 35 fell 0.25% to 11,119.10 points.

(Information by Tomás Cobos; edited in Spanish by Javi West Larrañaga)