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Former presidents Pedro Pablo Kuczynski, Alan Garcia and Alejandro Toledo all took undeclared campaign contribution in exchange for pledges to have the Brazilian construction giant win local tenders, prosecutors said.
Prosecutor Jose Domingo Perez opened a preliminary investigation of money laundering against the trio, as well as three individuals close to each of them, according to a statement from his office.
Prosecutors had previously announced they are investigating former president Ollanta Humala for allegedly taking $3 million in bribes from Odebrecht.
The four ex-presidents led Peru between 2000 and 2018.