British police said on Wednesday they would bring no charges against 12 men seized in raids to foil a suspected al-Qaeda plot that were brought forward due to a security breach. The men, 11 Pakistanis and one Briton, were arrested around northwest England on April 8 as part of an operation against what Prime Minister Gordon Brown called at the time a "very big terrorist plot". Police said all the suspects, aged between 22 and 38, had been released although 11 had been handed over to immigration officials and face deportation on national security grounds. Prosecutors said there was insufficient evidence to justify holding them any longer or bringing charges, police said. "As there are ongoing issues of matters of national security around this investigation, it does limit what we are able to say," said Chief Constable Peter Fahy.