Taranto, February 28 - Investigators in the southern city of Taranto are investigating eight people for possible manslaughter in connection with an accident at the troubled ILVA steel plant in which one worker was killed and another injured on Thursday. Ciro Moccia, 42, was killed after falling from the loading ramps of a battery of coke ovens while Antonio Liddi sustained serious injuries. The two were carrying out maintenance activities in a part of the plant that is undergoing renovation works and is not in operation. Unions called for a 24-hour strike to mourn the worker's death and complain against a series of accidents that have led to other deaths. Marco Bentivoglio, head of Italy's Fim Cisl union said: "After some years in which there were no more lethal accidents, the three deaths in recent months are serious and unacceptable". Mario Ghini, head of the national Uilm union also condemned the plant's safety record. "It's unacceptable that workers risk their lives while carrying out their activities in a working plant," he said. "It's even more absurd that they lose their lives while working in a part of a plant which is not operational".