The Egyptian authorities have seized documents which reportedly confirm Jewish ownership of property in Cairo.
The 1.7 million documents, weighing two tonnes, were confiscated as they were being shipped to Israel via Jordan.
The attempted delivery of the documents was called “the most dangerous case of security breach in history” by Egyptian media on Sunday.
Israeli authorities intended to use the documents and deeds in a legal suit to reclaim property that was confiscated from Cairo’s Jews during the 1952 revolution.