British Law Enforcement Release Six Alleged Pope Assassination Plotters

Six men who were held without charge in Briton for an alleged plot to kill Pope Benedict XVI have been released by their jailers.
To presumably carry on with their diabolical plan. This doesn't really count as foiling a plot, now does it? It's only the Pope, after all.
What if there had been threats to an Islamic Imam? Would there have been more concern then? Perhaps a little longer of a detention?