Natalee's Mom Voices Frustration

The parents of 18-year-old Natalee Holloway, who have been turning up the heat on Aruban authorities, pressuring them to be more aggressive about finding their daughter, grew more anguished after a judge ordered the release of two Surinamese brothers.

Holloway's mother, Beth Holloway Twitty, 44 said Tuesday she believes two Surinamese brothers released from custody are guilty, and she asked other countries not to offer them asylum if they flee the island.

"I'm asking all nations not to offer them a safe haven," Beth Holloway Twitty, mother of 18-year-old Natalee Holloway, told a news conference, her voice cracking with emotion.

A judge on Monday ordered the release of Surinamese brothers Deepak Kalpoe, 21, and Satish Kalpoe, 18, saying there was not sufficient evidence to continue holding them in the case.

"These criminals are now free to walk among the tourists of Aruba ... while I have not seen my beautiful daughter in 36 days," Holloway Twitty said of Surinamese brothers Deepak Kalpoe, 21, and Satish Kalpoe, 18.

"My greatest fear is that they will leave Aruba," she said.

There was no immediate response from the Kalpoes or their lawyers.

CBS News Correspondent Aleen Sirgany reports the hearing was the first to be attended by Natalee Holloway's parents.

"We just felt like it was important for us to be here. You know, this is a very important day for all of us," said Holloway's stepfather George "Jug" Twitty.

The rulings came after a closed hearing. No information was released on why the two brothers were released.

"The day finally came," David Kock, one of Satish Kalpoe's lawyers, said when contacted by The Associated Press. "I've been saying this for a long time: They have no basis to keep my client in detention. We are very happy.

Still in custody is 17-year-old Joran van der Sloot, son of a top justice official on the island, who admitted to being with Holloway alone the night she disappeared. The judge ordered that van der Sloot be held another 60 days. Van der Sloot has insisted that he did not harm Holloway.

"It's very clear where the finger is pointing now," Kock said, referring to van der Sloot.

Holloway vanished in the early hours of May 30, the last day of a five-day vacation on the Dutch Caribbean island to celebrate her high school graduation with 124 other students.

Beth Holloway Twitty, 44, arrived in Aruba within hours of her daughter's disappearance and has been on the island ever since, distributing fliers, monitoring searches and appearing on national U.S. television shows to keep pressure on investigators.

Attorney General Karin Janssen declined to comment Monday. Her office issued a statement saying prosecutors were considering an appeal of the judge's decision to release the Kalpoes. They have three days to do so.

Contacted by telephone, van der Sloot's father, Paul van der Sloot, said he had no comment on the judge's decision. Prior to the judge's ruling, one of Joran van der Sloot's attorneys, Antonio Carlo, would not say whether investigators had presented any new evidence against his client, but he said a judge did approve a motion allowing attorneys to be present whenever van der Sloot is interrogated. Carlo said previous motions requesting a lawyer's presence had been denied since the beginning of the case.

"It's important for me to say again today that my client maintains his innocence," Carlo added.

Under Dutch law that governs Aruba, a protectorate of the Netherlands, detainees can be held 116 days before being charged by a judge. Van der Sloot has not been charged.

Prosecutors have acknowledged they have no solid evidence to indicate that Holloway is dead. They have said a murder conviction is possible without a body, but the case requires strong evidence such as a confession, reliable statements and forensic evidence of wrongdoing.

The Kalpoe brothers have told police they dropped Holloway and van der Sloot off near the Marriott Hotel in the early morning hours of May 30 and that that was the last time they saw the blond-haired, blue-eyed teen.

Van der Sloot's mother, Anita van der Sloot, said her son told her during a prison visit that he was alone with Holloway on a beach that night but that he did not harm her.