[Updated at 1:13 p.m.] Joran van der Sloot has been arrested and is in police custody in Santiago, Chile, an Interpol spokesperson in Santiago told CNN.
Van der Sloot, who was previously considered a suspect in the 2005 disappearance of Alabama teenager Natalee Holloway in Aruba, is the main suspect in this week's slaying of 21-year-old Stephany Flores Ramirez, officials said. She was was found Wednesday in a Lima, Peru, hotel room registered to van der Sloot. Chilean police told CNN that paperwork showed that van der Sloot entered Chile on Wednesday.
Peruvian Interior Minister Octavio Salazar Miranda said Thursday that Peru has made arrangements with Interpol to extradite van der Sloot.
[Updated at 12:33 p.m.] Chilean investigators have told CNN Chile that Joran van der Sloot was spotted in Arica, Chile, near the Peruvian border and they believe he may still be there.
[Posted at 11:59 a.m.] Peruvian authorities investigating a young woman's slaying this week are working with officials from Interpol, Chile, Argentina and Colombia in the search for Joran van der Sloot, a Dutch man previously considered a suspect in the 2005 disappearance of Alabama teenager Natalee Holloway, the Peruvian justice minister said Thursday.
There is "incriminating evidence" linking van der Sloot to the killing of 21-year-old Stephany Flores Ramirez, who was found with multiple stab wounds in a Lima hotel room Wednesday, Cesar Guardia Vasquez, of Chile Interpol's criminal investigations unit, said at a news conference.
The hotel room where Flores was found was registered in van der Sloot's name, he said.
A hotel guest and an employee witnessed the pair entering the hotel room together at 5 a.m. on Sunday, Guardia said.
Police have video of the previous night, May 29, of van der Sloot and Flores together at the Atlantic City Casino in Lima, he said.
According to immigration officials, van der Sloot fled to Chile over land on Monday, Guardia said.
"We have all the evidence to show that the killer is this man," the victim's father, businessman and race-car driver Ricardo Flores told CNN en EspaÃ±ol.