Three of the men accused of plotting the 9/11 attacks on the US have entered into a pre-trial agreement. Khalid Sheikh Mohammed, Walid Muhammad Salih Mubarak Bin Attash, and Mustafa Ahmed Adam al-Hawsawi were all held at Guantanamo Bay without going to trail. The US Department of Defence claimed details of the deal had not yet been announced. However, local reports suggested a guilty plea came in exchange for the prosecution agreeing not to seek the death penalty. The 2001 attack resulted in nearly 3,000 people being killed in New York, Virginia and Pennsylvania. It was the deadliest attack on…