Two Colombian police generals have resigned following the murder of the sister of ex-President Cesar Gaviria. Generals Mauricio Gomez and Mario Gutierrez were responsible for security in the region where Liliana Gaviria was kidnapped and killed on Thursday. They stepped down after President Alvaro Uribe said there had been failings in her personal security. Law and order is a major issue in the upcoming May elections, which Mr Uribe is widely expected to win. Full Story