Thirty-three businessmen and former officials are being investigated in connection with the "Panama Papers" scandal, the massive leak of documents from Panamanian law firm Mossack Fonseca, SAT tax agency chief Aristoteles Nuñez said.
Audits are already being done of 18 people and two others are the subjects of requests for information from other countries, Nuñez told Radio Formula.
"There are 33 cases, some of them even have audits that are ongoing. The majority of them have to do with business activities and we're in the process" of working on them, Nuñez said in an interview with the radio station.
The individuals under investigation have not been identified because they are the targets of open investigations.
If investigators determine that the subjects failed to pay their taxes, the SAT will notify them and initiate the corresponding proceedings.
Nuñez confirmed that the SAT is investigating Emilio Lozoya, the former CEO of state-owned oil giant Pemex, and former Veracruz Gov. Miguel Aleman, Radio Formula reported.
Lawmakers from the conservative National Action Party, or PAN, and the leftist Party of the Democratic Revolution, or PRD, meanwhile, called on federal tax officials to speed up the probes of Mexican citizens implicated in the leak.
The parties said the investigations were essential because the government might "not just be dealing with tax evasion" but also "with the acquisition of illicit resources" by Mexicans, who may have deposited them in offshore "tax havens" via the Panamanian law firm.
The fact that prominent businessmen, including Juan Armando Hinojosa Cantu, Ricardo Salinas Pliego and Alfonso de Angoitia Noriega, are named in the documents is of concern, the political parties said.
The Panama Papers are a collection of about 11.5 million confidential documents leaked from Panama-based law firm Mossack Fonseca, which specializes in wealth management.