GUADALAJARA, Mexico (AP) — Several Mexican states cancelled school on Monday, with local and foreign governments warning their citizens to stay inside after widespread violence erupted following the army’s killing of the powerful leader of the Jalisco New Generation Cartel. Nemesio Rubén Oseguera Cervantes, known as 'El Mencho' was the boss of one of the fastest-growing criminal networks in Mexico, notorious for trafficking fentanyl, methamphetamine and cocaine to the United States and staging brazen attacks against government officials who challenged it.