A car bomb blew up outside the Athens stock exchange on Wednesday, slightly wounding one woman, damaging the building and setting eight vehicles ablaze, Greek police said. The Athens bourse said it would open normally despite the attack, the latest of several against business and police targets since the December 2008 police shooting of a teenager sparked Greece's worst riots in decades. The powerful blast came after an anonymous early morning warning call to a Greek newspaper. It blew out windows on several floors of the stock exchange and hurled debris hundreds of meters (yards) away from the building. "It was an explosive device. The remains of it were found in a damaged car," said Greek police spokesman Panayiotis Stathis. Police said a home-made bomb exploded at the same time outside a government building in the northern city of Thessaloniki, causing minor damage but no injuries. A car dealership near the Athens bourse was seriously damaged by the bomb, planted in a white van which was parked on the side of the building and which was completely destroyed by the blast. The chairman of the Athens Stock Exchange, Spyros Kapralos, said the damage to the building was substantial but officials were working hard to open for trading. "Despite the huge material damages caused to the building by today's explosion, both the Athens and the Cyprus stock markets will operate normally," the bourse said in a statement. The Athens stock exchange normally opens at 0730 GMT. Athens and Nicosia share a trading platform. The area was cordoned off by anti-terrorist police scouring for evidence. Leftist and anarchist guerrilla groups have claimed responsibility for several attacks against businesses, cars and police this year, culminating with the assassination of a policeman in his car in June. It was not immediately clear whether one of them was behind Wednesday's attack.