OMX, the Nordic stock exchange group, was forced to halt equity trading in Stockholm for over an hour today after being hit by serious technical problems. The shutdown came a day after it emerged OMX is in talks to fix computer glitches at the Osaka Securities Exchange.

A spokeswoman for OMX said computer errors in Stockholm meant users were unable to trade equities and related products on the exchange. She said it was too early to assess the cost of the shutdown.