"The Spanish ambassador to the United States, Javier Ruperez, who said he believes ETA was responsible, said 'in a way it is' Spain's September 11, referring to the 2001 terror attacks in New York and Washington."
Sept. 11, 2001 was two years, five months, and 27 days earlier, according to CalendarHome.com's date calculator. Or, put another way, 911 days earlier.
Tinfoil hats or not, plenty of folks aren't ready to pin this on ETA just yet. If it was Al Qaeda, there's probably more on the way.