The Rio-Antirio bridge in western Greece remained shut for a third day yesterday as efforts continued to repair a suspension cable that snapped on Thursday after a fire broke out. Experts believe it will take around two weeks to repair the bridge, which has drastically shortened travel times between the Peloponnese and central Greece since it opened to the public last August. Commuters must now revert back to the regular but slow ferry service that the bridge was designed to replace. In the meantime, the French engineers who constructed the 770-million-euro bridge are trying to determine the cause of the fire. According to initial assessments, it had been provoked by lightning. Other theories blame wires rubbing together in high winds or a short circuit in the electrical wires running along the suspension cables.