ORANJESTAD, Aruba - A disc jockey on an Aruban tourist party boat was detained Friday in the disappearance of Alabama teen Natalee Holloway, making him the fourth person held by police since the honors student vanished last month.

Meanwhile, Holloway's mother said she believed there might be more arrests before the case was resolved, although she expressed increasing frustration with the pace of the investigation.

Beth Holloway Twitty also held onto hope that her 18-year-old daughter, last seen May 30, was still alive.

Steve Gregory Croes, 26, whom authorities earlier identified only by the initials S.G.C., said he was contacted by police Thursday night and voluntarily gave a statement, said his employer, Marcus Wiggins.

Croes also said he knew one of two Surinamese brothers being detained.