Smoke rises above a parking lot of Madrid's airport after an explosion Dec. 30, 2006. (Xinhua/Reuters Photo) Photo Gallery >>>

    MADRID, Dec. 30 (Xinhua) -- A parking lot at Madrid's airport was wrecked by a car bomb explosion Saturday morning after a warning call, police said.

    The bomb went off at about 9:30 a.m. (0830 GMT) at the airport's new Terminal Four after a phone call to highway patrol police in the Basque region. Two police officers were slightly injured at the scene, the state radio reported.

    The caller did not say he issued the warning on behalf of the Basque separatist group ETA which used to phone in warnings of an imminent explosion.

    If confirmed, the ETA would break a permanent ceasefire it declared in March.

    The ETA, which wants to achieve independence for the Basque Country, a region that straddles northeastern Spain and southwestern France, has killed 850 people in its separatist activities since 1968.

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