The auditing unit of the Federal Electoral Institute, or IFE, will be asked to conduct a probe of alleged diversions of public funds by leftist presidential candidate Andres Manuel Lopez Obrador, Mexico's Institutional Revolutionary Party, or PRI, said Tuesday.

The allegations focus on Honestidad Valiente and Austeridad Republicana, the grassroots organizations that provided support to Lopez Obrador for his campaign trips and rallies before he became the left's presidential candidate.

The request will be made by the representative of the PRI's National Executive Committee before the IFE, Sebastian Lerdo de Tejada, at an unspecified date, the PRI saidn in a statement.

PRI candidate Enrique Peña Nieto won the July 1 presidential election with 38.21 percent of the vote, while Lopez Obrador took second place with 31.59 percent, according to the final official results released by the IFE.

Lopez Obrador is challenging the results, alleging that the PRI engaged in massive vote-buying.

"It is the duty of every authority to inform all tax authorities of any possible fraud against public funds," the PRI said.

"This political institution calls on the responsible authorities and institutions to do their work impartially and efficiently, especially when they do so in response to the complaints filed by citizens via the proper legal channnels," the PRI said.

There was "alleged triangulation of resources and financial schemes by the Honestidad Valiente and Austeridad Republicana organizations" based on "new evidence, hard numbers and indications" gathered since the election, the PRI said.

The grassroots organizations engaged in "probable tax fraud, use of illicit resources and a cover-up to benefit the losing candidate, Andres Manuel Lopez Obrador," the PRI said.

Lopez Obrador, who was the candidate of a coalition of leftist parties led by the Party of the Democratic Revolution, or PRD, said Sunday that he planned to hold an "Expofraude" on Aug. 12 at which evidence of election irregularities by the PRI would be presented to the public.

The PRD and the conservative National Action Party, or PAN, announced earlier this month that they planned to jointly file a complaint with the Attorney General's Office on alleged money laundering by the PRI.

The two parties also filed a request with the IFE for a speedy investigation of allegations of irregular use of campaign funds by the PRI, which governed Mexico from 1929 to 2000.

The TEPJF electoral court has until Aug. 31 to issue a ruling on the challenge filed by Lopez Obrador's Progressive Movement coalition, either certifying Peña Nieto the winner or calling for a new vote. EFE