The Basque separatist group ETA has claimed responsibility for a car bomb set off in a Madrid airport garage that has injured 19 people.
The bombing ends what was intended to be a permanent cease-fire between the Spanish government and ETA ("Basque Homeland and Freedom"), which has used terrorist tactics since its 1960s beginnings, in its quest for autonomy in the Basque region of Spain. The cease fire was declared in March 2006.

Comments
As of January 3, 2007, no member of ETA has claimed responsibility for the bombings at Baraja airport. The government is attributing the explosion to ETA because one of the callers announcing the bomb identified herself as a member of ETA. ETA itself denies this.
Thank you for your comment. You are right: As of January 6, ETA denies responsibility for the attack. The Spanish government appears to be proceeding with the expectation that the attack was committed by ETA, but investigators continue to look for clues that may identify the attackers.