Consumer electronics retailer Media Markt broke privacy laws by secretly filming staff, the Dutch privacy watchdog said on Thursday.

The retailer used mystery shoppers equipped with hidden cameras to film shop staff. The company then used the results in personnel evaluations. Images from security cameras were also used to judge staff performance.

The company has already apologised for its actions.

The CBP has not yet decided whether or not to fine the company. Employers can only film staff using secret cameras if there is widespread theft or fraud and only then under strict conditions, the organisation said in a statement.