Five Pakistani men arrested in a major British anti-terrorism operation but never charged have been refused bail because they had exchanged a series of coded emails, officials said. The five were among 12 men, mostly students, arrested in a high profile counter-terrorism raids across northwest England in April. They are being detained while the government tries to deport them and were refused bail at their hearing last month, the Special Immigration Appeals Commission (SIAC), which deals with such cases, said Friday. A series of seven emails exchanged between Shoaib Khan, 27, and an Al-Qaeda associate detailed a “nikah” or wedding which the security service said “most likely” referred to an intended attack. The emails also included girls' names such as “Nadia” which might refer to ingredients used in an explosive device, the ruling said.