On September 2011, new evidence emerged indicated the US Embassy in Athens was behind the telephone interceptions. The key evidence of complicity was that out of the 14 anonymous prepaid mobile phones used for the interception, three had been purchased by the same person at the same time as a fourth one. The fourth phone called mobile phones and landlines registered with the US Embassy in Athens. With a sim card registered to the US Embassy, it also called two telephone numbers in Ellicott City and Cantonsville, Maryland, both NSA bedroom communities. A criminal investigation was launched, and in February 2015, Greek investigators were finally able to finger a suspect, William George Basil, a NSA operative from a Greek immigrant background. Greek authorities have issued a warrant for Basil's arrest, who has since gone into hiding.