Greek police are on alert after discovering a backpack with residue of an explosive device hanging from the main entry door of the building where the Labour Ministry is located on Stadiou avenue, in Athens, Monday morning. Newspaper “Efimerida ton Syntakton” had received an anonymous phone call at 1.20am warning that an explosive device had been planted at the Labour Ministry building. Police immediately cordoned off Stadiou and Piraeus avenues before the anti-explosive unit proceeded to a perform a controlled explosion with police conducting investigations in the building. According to sources, an explosive device was found in the backpack, which had not been detonated. The anonymous phone caller had informed the newspaper the device would go off 40 minutes after his call.