Today morning an explosion was heard at the walls of the Georgian Labor Party headquarters. According to the data provided by the ministry of home affairs there are no victims, however the construction was seriously damaged. As party leader Shalva Natelashvili told journalists, unknown people threw a self-made explosive assembly to the building. He called the incident just a terrorist act. A criminal case was instituted and the investigation launched. The Labor Party, which was earlier in the opposition to Eduard Shevarnadze, now refuses to cooperate with the new Georgian leadership "because of its being non-legitimate", RIA Novosti reports.