MEXICO CITY — The mayor of a city south of Mexico’s capital was shot to death on Saturday, less than a day after taking office, officials said. Gunmen burst into the house of Mayor Gisela Mota in the city of Temixco and killed her, said the government of Morelos state, where Temixco is located. Two presumed assailants were killed and two others detained, said Morelos Gov. Graco Ramirez in the government statement. Officials attributed her killing to organized crime. ... Temixco is a city of about 100,000 people neighboring Cuernavaca, a resort and industrial city which has been suffering kidnappings...