The NSA, Again?

News story:

An unusual amount of highly suspicious cellphone activity in the Washington, D.C., region is fueling concerns that a rogue entity is surveying the communications of numerous individuals, likely including U.S. government officials and foreign diplomats, according to documents viewed by the Washington Free Beacon and conversations with security insiders....

So far, we know nothing that precludes the NSA as 'the rogue entity.'