As reported by Censor.NET referring to RBC-Ukraine, NABU Director Artem Sytnyk said it at a news conference.
"We have compared the documents at our disposal with the documents provided by Serhii Leshchenko and have found certain discrepancies," Sytnyk said.
He said that the NABU has documents, including 25,000 records, covering the period of Ukraine's 2012 parliamentary elections.
"There are a lot of records showing sums and intermediaries. For example, a court is mentioned, but no peculiar judge, just an intermediary," Sytnyk explained.
At the same time, he stressed that only the most outrageous amounts will be probed.
"Appropriate legislative amendments would be very helpful in the fight against corruption," the official stressed.
Earlier, Petro Poroshenko Bloc (PPB) MP Serhii Leshchenko and journalists Anton Marchuk and Sevhil Musaieva-Borovyk published some of the documents proving the existence of Party of Regions' slush funds. According to the materials, the Party of Regions spent $66 million on political corruption over the second half of 2012.
Even earlier, ex-Deputy Head of the Security Service of Ukraine Viktor Trepak said he had given the information about Party of Regions' slush funds to the NABU.
Related materials: Party of Regions' off-the-book payments