Meanwhile. a judge considered prosecutors' request to extend the detention of three other young men in custody--one the son of a prominent justice official on the island.
Steve Gregory Croes, 26, was arrested early Friday, a day after he was contacted by police and went voluntarily to the station to give a statement, his employer, Marcus Wiggins said.
Croes, a disc jockey on the party boat "Tattoo," said he knew one of two brothers from Suriname being held in the case because he went to the same Internet cafe as the brother, Wiggins said.
The Aruban attorney general's office released a statement announcing the arrest, but identified Croes only by his initials, "S.G.C."
The person "is suspected of being involved in the disappearance of the tourist," the statement said, referring to 18-year-old Natalee Holloway, who vanished in the early morning hours of May 30. "As a result of the ongoing investigation, this is all the information that can be given at this time."
Meanwhile, Holloway's mother told CBS News that she expected more arrests very soon. She also expressed frustration with the lack of information authorities were sharing with her. Still, was holding onto hope that her daughter was still alive.
The "Tattoo" is a large tourist boat offering nightly dining, dancing and swimming, according to a promotional brochure. Wiggins, who owns the boat, said he had never seen the Surinamese brothers, Deepak Kalpoe, 21, and Satish Kalpoe, 18; or fellow detainee Joran van der Sloot, 17, son of justice official Paul van der Sloot, on board the boat. The brochure notes that patrons must be 18 or older.