The European Court of Justice has cast doubt on an agreement giving US companies access to the online information of millions of EU citizens.

The European Court of Justice is to rule later in a case against Facebook over personal data held by the social media site.

US spy chiefs can be blocked from accessing online data of European citizens, a court has ruled.

A judicial review brought by an Austrian student over the transfer of personal information by Facebook is to go ahead in the High Court in Dublin this week.