The bodies of Marcela Yarce, the founder of a political magazine, and Rocio González, a freelance journalist, have been discovered by joggers in El Mirador park in Iztapalapa, Mexico City. The women’s necks showed strangulation marks and their hands were tied behind their backs, said a spokesman for Mexico City police. Authorities gave no motive for the killings. Yarce founded Contralinea magazine, and González was a freelancer and former reporter for the Televisa television network.