In September 2006, Pope Benedict XVI gave a speech on the question of the "reasonableness" of the Christian faith, to the University of Regensburg in Germany. In the Regensburg lecture he spoke about rationality in faith, and cited comments by the fourteenth-century Byzantine emperor Manuel II Palaiologos, who, as the Pope put it, said "show me just what Mohamed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." The citation attracted severe criticism from Muslims around the world, including the parliament of Pakistan, which condemned the Pope for his comments and sought an apology from him. Following the speech, on 17 September Choudary led a protest outside Westminster Cathedral, where he told reporters "Whoever insults the message of Mohammed is going to be subject to capital punishment." The Metropolitan Police investigated his comments, but concluded that "no substantive offences" were committed during the demonstration. The Shadow Home Secretary, David Davis, who had called for action to be taken against Choudary, said: "It is quite disgraceful. It sends out a message to Muslim extremists that we, as a country, do not have the moral courage to stand up to them." However, there are claims that Choudary UK law enforcement had, on multiple occasions, sufficient evidence to make an arrest. They were prevented from doing so as he was central to investigations conducted by British Security Services.