During a preliminary interrogation, "He only [said] he knew her" and that he met her at a Lima casino, says Chilean investigative police spokesman Fernando Ovalle.
Van der Sloot, 23, was arrested Thursday in Chile, a day after Flores's body was found in a Lima, Peru hotel room which had been registered under the Dutch national's name. Authorities said there is "incriminating evidence" linking Van der Sloot to the 21-year-old's death.
Early Friday morning, Van der Sloot, was placed on an airplane back to Peru to face charges. He was expected to be handed over to Peruvian police at the border of the two countries, The Associated Press reports.
Already having witnessed her son be accused of murder once before – in the case of disappeared American teen Natalee Holloway – Anita Van der Sloot says it's again hard to fathom that he could have anything to do with a young woman's death.
Van der Sloot's mom, who spoke to Joran by telephone Thursday evening, is "shocked" by the arrest and latest allegations, the family's lawyer Bert de Rooij tells Dutch radio station Radio 1 News.
Rooij declined to give details about the conversation but said Van der Sloot had "certainly not" admitted to murdering Flores, Dutch News reports.