Investigations into the cause of a bus crash that killed three people and injured 10 others at a frequent accident spot had not reached a conclusion by last night, after the coach went off the side of a highway close to Lamia, central Greece, early on Saturday. The bus, which was carrying 48 elderly passengers, was traveling from seaside Kammena Vourla to Plastiras Lake when, at 7.30 a.m., the driver lost control of the vehicle. It traveled for 50 meters scraping up against the guard rails before falling into a roadside ditch. Initial investigations showed that a mechanical problem caused the accident. Most of the passengers, who were rushed to a Lamia hospital minutes after the accident occurred, were allowed to leave later in the day. Passengers said that the driver had not been speeding. The bus tachometer showed that the bus was traveling at just below 80 kilometers an hour when the accident occurred along the Maliakos Gulf part of the Athens-Thessaloniki highway, where seven teenage students where killed last September in a bus crash.