HURGHADA, Egypt — The Egyptian university graduate who stabbed two German women to death at a popular Red Sea resort first sat and spoke to them in fluent German before producing a large kitchen knife and attacking them, security officials said Saturday. No group claimed responsibility for the Friday attack, but it appeared to have been inspired by recent calls made by the local affiliate of the extremist Islamic State group for its followers to attack Egypt’s minority Christians and foreign tourists. The officials said Abdel-Rahman hails from the Nile Delta province of Kafr el-Sheikh where he attended the business school of the local branch of Al-Azhar University — the world’s foremost seat of learning of Sunni Islam and the target of mounting criticism in recent months over its alleged radical teachings and doctrinal rigidity. A statement by the national security prosecution’s office, which is questioning Shaaban in Cairo, said Saturday that his motives and ideological convictions remained unclear. “The characterization of the action committed by the culprit, whether it is an individual act, criminal or terrorist, is not clear to the prosecution at this time,” said the statement.