By Julia Fioretti BRUSSELS (Reuters) – The United States has not satisfied the European Union's concerns about Yahoo's scanning of all customers' incoming emails for U.S. intelligence purposes, the bloc's justice chief told Reuters in an interview. The European Commission, the EU executive, asked the United States in November for clarifications on the secret court order served to Yahoo as part of its monitoring of a new transatlantic pact facilitating the exchange of personal data by businesses. To clinch an agreement on the EU-U.S. Privacy Shield, as the data transfer framework is known, Washington pledged not to engage in mass, indiscriminate surveillance.