A suspected drug cartel leader arrested in Mexico has confessed to ordering the killings of 1,500 people, reports the BBC. Jose Antonio Acosta Hernandez, also known as El Diego, is the 33-year-old leader of the Juarez cartel La Linea, according to police. He's also suspected of planning a notorious car bomb attack that killed four people, and the 2010 killing of a US consulate worker and her husband. Juarez, on the border with Texas, is the most violent city in Mexico, with more than 3,000 killings last year. (More Mexican drug cartel stories.)