Crime FBI Joins Search for 6-Year-Old in Hawaii Who Has Been Missing for 5 Days "At this time foul play has not been ruled out," Honolulu police said in a statement Thursday By Joelle Goldstein Joelle Goldstein Instagram Twitter Joelle Goldstein is the Staff Editor of TV for PEOPLE Digital. She has been with the brand for five years, beginning her time as a digital news writer, where she covered everything from entertainment news to crime stories and royal tours. Since then, she has worked as a writer-reporter on the Human Interest team and an associate editor on the TV team. In her current role, Joelle helps oversee all things TV, and enjoys being able to say she has to watch The Kardashians, America's Got Talent, Love Is Blind and Dancing with the Stars for her "work" responsibilities. Prior to joining PEOPLE, Joelle was employed at The Hollywood Reporter, where she was co-nominated at the 2019 GLAAD Media Awards for Outstanding Magazine Article for feature cover story. She graduated from Ithaca College with a Bachelor's degree in Television-Radio (and an appearance in the NCAA Women's Volleyball Final Four!) People Editorial Guidelines and Ashley Boucher Published on September 17, 2021 06:38 PM Share Tweet Pin Email Isabella Kalua. Photo: Honolulu Police Department A 6-year-old girl has been missing in Hawaii for five days, prompting the FBI to join the investigation. Isabella Kalua was last seen on Sunday night at her home in Waimanalo, Oahu, the Honolulu Police Department said in a press release Monday. The FBI joined search efforts on Wednesday, Hawaii News Now reported. Authorities have yet to rule out foul play. "We have conducted numerous interviews; however, there are still individuals, to include acquaintances and family members, who have yet to come forward to be interviewed," the Honolulu Police Department said in a statement to local news station KITV. Teen Reunites with Her Mother Nearly 14 Years After Being Abducted from Her Fla. Home at Age 6 "We hope that this will change in the near future as the investigation and search for Isabella continues," the statement said. "At this time foul play has not been ruled out." The search currently spans from Waimanalo Beach to the Olomana Golf Course, according to ABC News, and has included crews from the coast guard and volunteers in addition to police and the FBI. Isabella was in a foster home under the care of Sonny and Lehua Kalua until they adopted her within the last year, the Star-Advertiser reported. The couple reportedly changed her legal name from Ariel Sellers to Isabella Kalua, her biological family told the outlet. Sonny and Lehua withdrew Isabella from kindergarten at Waimanalo Elementary in June, a spokesperson for the Department of Education tells PEOPLE. Isabella attended kindergarten virtually last school year because schools were shut down due to COVID-19, the spokesperson tells PEOPLE. When school returned to in-person learning, they opted for Isabella to continue with distance learning. In June, her adoptive family filed paperwork with the school to withdraw her with the intent to home school, the spokesperson says. With no sign of Kalua over the last few days, her family said they're trying to stay hopeful that she is still alive, but it's becoming increasingly difficult by the day. Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories. "As time go on, we could end up breaking down. We're all tired, we're all worried. It's hard. It's really hard. We're trying to hold on as much as we can," her aunt Lana Idao told KITV. "Think positive. That's all we can do is think positive and keep going and going and going until we hear something." "I don't want to think the worst-case scenario," Alena Kaeo, Isabella's other aunt, said. "But it is always is a possibility. Again, I'm trying to keep my faith as strong as possible and I pray — I pray hard that she is safe. I don't want to think the worst but it is a possibility." Authorities believe Isabella, who has brown hair and brown eyes, was likely wearing a black hoodie, black leggings, colorful socks and Nike slides when she disappeared. Anyone with information about Kalua's whereabouts is asked to call HPD's CrimeStoppers at (808) 955-8300. The public can also send anonymous web tips here.