Nasdaq Nordic/Baltic was closed for several hours wednesday

Nasdaq Inc. is reviewing its systems to avoid a repeat of an hours-long shutdown in trading across the Nordic and Baltic markets. Trading went down Wednesday morning across the region and didn’t start up until shortly after 2 p.m. after an “errant fire extinguisher system” caused “connectivity issues” at a third-party data center in Vasby, a Stockholm suburb.

The halt affected equity and fixed-income trading on exchanges in Copenhagen, Helsinki, Reykjavik, Riga, Stockholm, Tallinn and Vilnius, as well as trading in Nordic index, equity and fixed-income derivatives, and commodities. Any trades that took place early in the day will be canceled, according to Nasdaq.

Sweden’s National Debt Office was also forced to postpone a bond auction to Thursday.

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