The US Defence Department announced that three men accused of planning the September 11, 2001, terrorist attacks have agreed to a pre-trial deal. Khalid Sheikh Mohammad, Walid Muhammad Salih Mubarak Bin Attash, and Mustafa Ahmed Adam al-Hawsawi have been held at the Guantanamo Bay US Navy base for several years without trial. They will plead guilty and, in exchange, be spared the risk of the death penalty. Memorial in New York marks 20 years since 9/11The details of the plea deal have not been released by officials. However according to US media, Chief prosecutor Rear Admiral Aaron Rugh inform…