Funds were detected through more than 20,000 suspicious activity reports flagged by the South American country's financial crimes unit for over three years, officials say.
Petro's hard-fought victory in June elections brought Colombia, long ruled by a conservative elite, into an expanding left-wing fold in Latin America.
Petro has promised to raise taxes on the rich, invest in health care and education, and reform the police after a brutal crackdown on anti-inequality protests last year.
Colombia was one of around 60 countries to reject Venezuela’s 2018 presidential election, which was boycotted by the opposition.
The state response has been "insufficient to reduce the levels of violence, prevent abuses committed by criminal organisations and adequately protect communities in the territories," according to the report.
"What I request is a ceasefire that will be bilateral," to allow for talks "to bring an end to the war in Colombia," President-elect Gustavo Petro tells the South American country's last active guerrilla group.
President-elect Gustavo Petro receives 896-page report that concludes Colombians suffer from "collective traumas" passed down "from one generation to another".
The tragedy occurred at a prison facility in the city of Tulua during an escape attempt followed by a fire, Colombian authorities say.
Stand collapses during bullfight in central El Espina municipality, leaving at least five people dead and over 300 injured, officials say.
Gustavo Petro, a former guerilla, who fought against the Colombian government in the past, will now lead the South American country.
National Liberation Army or ELN, the South American country's last recognised guerrilla group, says it is ready to reopen peace talks with the new government of ex-rebel Gustavo Petro who was elected the country's first leftist president.
Leftist ex-guerrilla Gustavo Petro defeats millionaire businessman rival Rodolfo Hernandez in Colombia's presidential vote, according to Latin American country's election authority.
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