Mural on side of house in Cheltenham shows three men huddled round a pay phone . The artwork emerged a day before The Washington Post and United States arm of The Guardian were awarded a Pulitzer Prize for their reporting on the NSA revelations , described as `` marked by authoritative and insightful reports that helped the public understand how the disclosures fit into the larger framework of national security . '' Clad in trench coats and dark glasses , they hold old-fashioned listening equipment . The street art has been widely attributed to graffiti artist Britain . Cheltenham 's the U.S. National Security Agency , the equivalent of GCHQ , is based in Cheltenham .
Mural on side of house in Cheltenham shows three men huddled round a pay phone . Clad in trench coats and dark glasses , they hold old-fashioned listening equipment . The street art has been widely attributed to graffiti artist Britain . Cheltenham 's the U.S. National Security Agency , the equivalent of GCHQ , is based in Cheltenham .