New documents leaked by Edward Snowden suggest up to 122 world leaders have been targeted by the National Security Agency in the course of its surveillance operations. The fresh revelations, published in Germany’s Der Spiegel over the weekend, claim that the NSA’s spying network is more wide-ranging than was previously thought. According to the documents, a system known as Nymrod was used to gather intelligence on heads of state across various communication platforms, including computers and telephone calls.