London police released six men who were detained on Friday on suspicion of plotting an attack on Pope Benedict XVI during his visit to the U.K., BBC reported on Sunday. "Six men arrested by police investigating an alleged plot to attack the Pope have all been released without charge," BBC said, citing a Scotland Yard statement. The six men, employed as street cleaners in Westminster, were arrested after they were overheard in a staff canteen talking about firing a rocket-propelled grenade at the Pope. All the six are aged between 26 and 50 and are reportedly of North African origin. Police questioned them and searched their apartments and office, but found no evidence that they indeed posed a threat for the Pontiff's security. Benedict XVI arrived on the first-ever papal visit to the U.K. on September 16.