No one knows for sure what caused this signal. There is a slight possibility that it just might originate from an extraterrestrial intelligence...

Also it's possible that the succession of shrieking hysterical violently antagonistic Arab male voices that have led at least four stories I've heard this past week on NPR, followed by calm, reasonable, intelligent English-speaking voices, primarily Jewish, were only there in succession by coincidence, and not as a result of racist bigotry on the part of the NPR production staff et al.