Britain mourns murdered MP amid suspended EU campaign

By Elisabeth O'Leary and Paul Sandle BIRSTALL, England (Reuters) - Britain mourned Member of Parliament Jo Cox on Friday after a man with suspected neo-Nazi links and a history of mental illness was arrested over a killing that has thrown next week's referendum on European Union membership into limbo. Cox, 41, a supporter of Britain staying in the EU, was shot and stabbed on Thursday by a man who witnesses said shouted "Britain first" in her own electoral district near Leeds in the county of Wes