Alberto Fujimori's eldest daughter (1990-2000) was detained preventively for a period of 10 days after she went to testify before a judge, said her lawyer, Giuliana Loza, who described the judicial decision as "outrage and abuse".
The arrest occurred at the request of the prosecution at the end of the hearing of Keiko, 43, before Judge Richard Concepción Carhuancho.
"She has made herself available to the prosecution," the lawyer added, noting that the measure took them by surprise.
The prison order against the Popular Force party leader includes 19 other people, including Jaime Yoshiyama and Augusto Bedoya, investigated for allegedly receiving funds from the Brazilian construction company Odebrecht for Keiko's presidential campaign in 2011.
Keiko was detained when going to the office of the Prosecutor General after being summoned to testify for the contributions received by her party in the 2011 campaign, won by her rival Ollanta Humala. She went accompanied by her husband, Mark Vito Villanella.
The money laundering prosecutor, José Domingo Pérez, attributed Keiko to leading a "criminal organization" within his party, which dominates the Peruvian Congress, for receiving illicit contributions.
The arrest warrant is based on new information received by the Peruvian prosecutor's office of his Brazilian counterpart, which would prove that Keiko's party received contributions of 1.2 million dollars for its 2011 campaign.
