Mumbai: Four persons were killed and three injured in anaccident on the Mumbai-Pune Expressway Friday, police said. A truck, whilenegotiating a turn, keeled over and fell on two cars in the opposite lane belownear Khalapur around 11.45 am, a police officer said. One of the cars waspushed off the edge of the road and fell down 40 feet into a gorge, he said. Fourpassengers in the cars including two women died while three persons sustainedinjuries and are undergoing treatment at a nearby hospital, he said. The conditionof two of them was stated to be critical, the official added.