Gunmen have shot dead the mayor of a small town in western Mexico, and at least 17 others, officials say.

Mexico’s Attorney General’s Office said Tuesday that it was investigating former president Enrique Peña Nieto for suspected crimes including illicit enrichment and money laundering.

During this period, Caro Quintero’s lawyers will probably file appeals to try to delay the extradition process.

U.S. to seek his extradition; cartel boss evaded authorities for nearly a decade after a Mexican appeals court freed him