MADRID, Feb. 9 (Xinhuanet) -- A powerful explosion occurred outside Madrid's main convention center Wednesday and 39 people were injured in the blast.

    The explosion took place following a warning from the armed Basque separatist group ETA, local TV reported.

    Meanwhile, Spanish Prime Minister Jose Luis Rodriguez Zapatero,who is currently paying a visit to Poland, condemned the car bomb blast in Madrid, saying "there is no place in society for terrorists."

    "I say to the ETA terrorists and those who back them that there is no place for them in society," Zapatero told reporters ata joint press conference with Polish Prime Minister Marek Balka inWarsaw. Enditem