ROME, May 8 — Investigators analyzing computers seized from an Italian mosque say they have uncovered images of the twin towers that were downloaded just days before the 9/11 attacks, as well as a trove of pornographic photos they believe were used to conceal coded messages. On Sept. 4, 2001, according to investigators, pictures of the World Trade Center were saved as temporary files on one of the computers at the Via Quaranta mosque in Milan — the mosque frequented by Abdelkader Mahmoud Es Sayed, also known as Abu Saleh, an Egyptian currently on trial in absentia in Milan on...