Explosion at Civil Guard barracks kills 1, wounds four in Spain

MADRID, Spain (CNN) - A car bomb explosion at a Civil Guard barracks in northern Spain killed a member of the Civil Guard and wounded four others Wednesday, a Basque regional police spokeswoman told CNN.

There was no immediate claim of responsibility, but authorities blamed the Basque separatist group ETA, said the spokeswoman, who by custom is not identified.

No warning preceded the blast around 3 a.m. local time (9 pm ET Tuesday) in Legutiano, a town in the Basque region of Spain, the spokeswoman said.