ORANJESTAD, Aruba (AP) -- The mother of missing Alabama teenager Natalee Holloway called for more help from the United States in a massive search as police and volunteers in Aruba combed beaches and scrubland for a fifth consecutive day Friday on the Dutch Caribbean island.
Volunteers put up posters throughout the island with a photo of Holloway, saying she was missing. But the wording on the posters was changed Friday to add a caption under her photo saying: "Kidnapped since 1:30 a.m. May 30."
Authorities say there is no evidence that Holloway was abducted, but police commissioner Jan van der Straaten said "after four of five days you are afraid a crime has been committed."
Holloway, 18, disappeared early Monday as she neared the end of a trip to Aruba to celebrate her graduation from high school. Four days later, the Alabama teenager is still missing, despite an extensive search of the Dutch Caribbean island.
On the island remarkable for its absence of violent crime, hundreds of residents and tourists posted fliers to help the hunt. FBI agents helped the Dutch military and Aruba police scour outlying scrubland with helicopters and all-terrain vehicles but found no trace of her.
Aruba radio and television stations broadcast a reward offer from Holloway's family, though they did not specify an amount. The family promised to reward anyone who brings her safely to a police station or hospital.
"Everybody has been quite supportive," the teenager's mother, Beth Holloway Twitty, told The Associated Press. "I am not leaving. I am going to have Natalee with me."
Holloway's family wants the Dutch government to officially ask the U.S. government for more direct help in the search, Holloway Twitty said later at a press conference.
"We all have a common goal to find Natalee so we can bring her home," the mother said, thanking officials, volunteers and residents. She choked up as she finished the statement and left the room in tears.
Holloway came to Aruba for a five-day excursion with 124 seniors and 40 chaperons from Mountain Brook High School, near Birmingham, Alabama.
She was last seen around 2 a.m. Monday, Attorney General Caren Janssen said Thursday. Police discount the possibility she left the island, because they found her passport in her hotel room, van der Straaten said.
Hopes were lifted briefly just before midnight Thursday when a news photographer said he had seen Holloway on the west side of the island. Police rushed to the scene but found an island girl who fit the description but had brown hair, not Holloway's long blond tresses.
Dressed in the same blue-and-green striped, low-cut blouse and denim miniskirt that she wore at the beach earlier in the day, Holloway spent Sunday evening partying at Carlos 'N Charlie's, a popular restaurant and dance spot where tourists and locals meet in the capital, Oranjestad.
She left 10 minutes before closing at 1 a.m., said the restaurant's master of ceremonies Jose Hernandez, 38. "Nothing was out of the ordinary."
Friends saw her getting into a vehicle outside the nightclub. She did not show up to catch her flight Monday. Her stepmother, Robin Holloway, said Natalee was last seen with a local resident who claimed to be a foreign exchange student.
Police questioned and released three Aruban students who said they dropped Holloway off early Monday at the Holiday Inn where she had been staying, about three miles from Oranjestad, said police assistant inspector Jules Sambo.
"We don't have any indication as to if she is alive," Sambo said. "The whole population is aware that she is missing. The police are doing everything to find her."
Several family members arrived the day after she disappeared. Her mother and her father, David Holloway of Meridian, Miss., went on television Thursday night to appeal to residents for information.
"Natalee is a well-traveled teenager. She has traveled to Europe, Canada," family spokeswoman Marcia Twitty told ABC's "Good Morning America."
She added that Holloway would not get into a car with strangers. "This is totally, totally out of character for Natalee," she said.
The island of 72,000 off the coast of Venezuela has a reputation of being all but free of crime for tourists.
There was one murder and six rapes last year and two murders and three rapes this year. But all the rapes were committed by local men against local women. The two murders involved drug addicts who died in knife fights.
"Aruba is a happy island and a safe island," said Janssen, the attorney general. "We're looking everywhere."