The decision came as Natalee Holloway's family asked a private group from Texas to conduct its own search for her. Her family is also planning to file a lawsuit demanding authorities give them the evidence gathered in the three weeks since 18-year-old vanished.
The court ordered Steve Gregory Croes, 26, held for eight days, said the attorney general's spokeswoman, Mariaine Croes. The two are not related.
Croes, who was arrested Friday, pulled the white T-shirt he was wearing up over his head to cover his face as he was led into the court in handcuffs. He was later whisked away in a police car.
Croes said he knew one of two Surinamese brothers being held in the case because they went to the same Internet cafe, according to Marcus Wiggins, Croes' employer on the party boat Tattoo. It was not known what other connection he may have had to either the brothers or a third young man in detention, 17-year-old Joran van der Sloot, the son of a justice official in Aruba. The boat Tattoo docks near the Holiday Inn where Holloway was staying.
Holloway, of Mountain Brook, Ala., disappeared in the early hours of May 30, the last day of a five-day vacation with 124 students celebrating their high school graduation. Her passport and packed bags were found in her room.
Joran van der Sloot and two Surinamese brothers, Deepak Kalpoe, 21, and Satish Kalpoe, 18, were among the last people reported to be with Holloway the night she disappeared. The Kalpoe brothers told police they took Holloway to a northern beach but dropped her off at her hotel, where they claim she was approached by a security guard.
On Saturday, a judge ordered the three must stay in jail at least another week. No one has been charged in the case.
CBS News Correspondent Kelly Cobiella reports that they have been moved to a prison on the southern end of the island where they'll stay for at least another week.
The missing girl's uncle, Paul Reynolds, told Court TV Monday that the family has contracted Texas EquuSearch Mounted Search and Recovery Team to do another search of Aruba.
"They are going to help us search for Natalee in ways we couldn't before," Reynolds said without offering details.
Texas EquuSearch, made up of volunteers, said on its Web site that a team is traveling to Aruba this week.
The missing student's mother, Beth Holloway Twitty, says the family has contracted an Aruban lawyer and is preparing a lawsuit demanding access to all information and potential evidence that police and prosecutors have gathered.
"I want to see the police record from May 30th," said Holloway, who has insisted the three young men hold the key to the investigation and that authorities should press them harder to tell the truth.