The murder of a British soldier in London by suspected extremists prompted "tough questions" about the country, dpa quoted Prime Minister David Cameron as saying Monday. "When young men born and bred in this country are radicalized and turned into killers, we have to ask some tough question about what is happening in this country," Cameron told parliament after the first meeting of a task force he set up last month after the killing of Lee Rigby. "Those who carried out this callous and abhorrent crime sought to justify their actions by an extremist ideology that perverts and warps Islam to create a culture of victimhood and justify violence," he said.