Aruba's prime minister has urged investigators to give the FBI all documents related to the disappearance of Alabama teenager Natalee Holloway (search), according to a letter released late Friday.

Prime Minister Nelson Oduber (search) asked in the letter to Attorney General Karin Janssen that the bureau be allowed "complete access to the dossier, including transcripts, audio tapes or video registration of interrogations, plus all materials that are connected to this case, in as much as our judicial system allows."

FBI (search) agents have been advising Aruban authorities in the six-week-old investigation but have not had access to case records, said government spokesman Ruben Trapenberg.

FBI spokeswoman Judy Orihuela said the FBI has pressed for access to the documents.

Trapenberg said Janssen had not yet responded to the government's request. The attorney general could not immediately be reached for comment Friday.

Joran van der Sloot (search), the 17-year-old son of a judge in training on the island, is the only person still in custody in the case. He and two Surinamese brothers, who were arrested and later released, were the last people to see Holloway before she vanished in the early hours of May 30.

Holloway disappeared hours before she was to catch a return flight to Mountain Brook, Ala., at the end of a high school graduation trip. Extensive searches by Dutch marines, Aruban police, and some 2,000 volunteers have found no trace of her.

Authorities took DNA samples from van der Sloot and the Suriname brothers on Tuesday, a day after investigators said they would conduct genetic tests on blond hair attached to duct tape that was found along Aruba's northeastern coast. It could take a week or two before the test results are known.