(Telecompaper) The EU's Article 29 group has started an investigation into WhatsApp's privacy policy. The investigation is a result of WhatsApp starting to share some of its data with parent company Facebook. In a letter to WhatsApp CEO Jan Koum, the work group said that is has serious concerns about how WhatsApp informed users of the change in its policy and whether the consent of users can be considered valid. It also noted that the change in policy contradicts what Facebook previously said, that it would not share personal data with WhatsApp. The group asked the companies to provide more specific information on exactly what data is being shared, from where it is collected and how it's used. In addition, the group urged Facebook and WhatsApp to not share the data until it can be determined whether the processes are legal in the EU.