Shares in one of Portugal's leading financial institutions, Banco Espirito Santo, were suspended from trading on Thursday after dropping another 17 percent for a total decline in value of 32 percent this week, Dow Jones reported.
Portugal's main stock index dropped on the news, and Dow Jones said the bank's troubles have led to cancelled bond sales and stock market declines across the European continent.
Read MorePortugal concerns compound global stock selloff
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—By CNBC.com