The latest revelations from whistleblower Edward Snowden are threatening a major rift between the U.S. and the European Union. Citing documents released by Snowden, the German magazine Der Spiegel reports the National Security Agency spied on European Union offices in Brussels, Washington and at the United Nations. The NSA allegedly planted bugs to listen in on conversations and phone calls, and also hacked into the EU computer network to access emails. According to The Guardian, one NSA document lists 38 embassies and missions as “targets,” including not just the EU but also countries such as Japan, Mexico, South Korea, India and Turkey. The revelations come just as the U.S. and EU are preparing to negotiate a trans-Atlantic trade deal. On Sunday, the president of the European Parliament, Martin Schulz, called on the U.S. to explain the latest spying claims.

Martin Schulz: “I feel treated as a European and representative of a European institution like the representative of an enemy. Is this the basis for a constructive relationship on the basis of mutual trust? I think no. And therefore my first request to the embassy of the United States here in Brussels is: Is it true? And in case it is true, why? They should justify. It is shocking that the United States take measures against their most important and nearest allies, comparable to measures taken in the past by the KGB, by the secret service of the Soviet Union.”