Europe’s national privacy agencies demanded more details on Wednesday about whether the European Union’s new data transfer agreement with the United States would adequately protect individuals’ personal information.

The move by the privacy regulators, which represent individual countries within the 28-nation European Union, indicates an unwillingness to accept the word of officials in Brussels that they can adequately safeguard citizens’ personal data.

The group asked the European Commission, the executive arm of the European Union, to provide a fuller explanation of how safeguards would work and to explain how Europeans could seek legal redress in the United States if they believed their data was misused.

The primary concern is how much access American intelligence agencies will have to European citizens’ personal information.