A team of US archaeologists has discovered the ruins of a city dating back to the period of the first farmers 7,000 years ago in Egypt's Fayyum oasis, the supreme council of antiquities said. "An electro-magnetic survey revealed the existence in the Karanis region of a network of walls and roads similar to those constructed during the Greco-Roman period," the council's chief Zahi Hawwas said. The remnants of the city are "still buried beneath the sand and the details of this discovery will be revealed in due course," Mr Hawwas said. "The artefacts consist of the remains of walls and...