(CNN)In airport surveillance pictures, the three young women look like typical travelers. But their destination was anything but ordinary. British police announced last week that three east London classmates -- Shamima Begum, 15; Kadiza Sultana, 16; and Amira Abase, 15 -- had flown aboard a Turkish Airlines plane from London's Gatwick Airport to Istanbul on February 17. From there, they wanted to go to Syria with the apparent goal of joining ISIS. On Tuesday, authorities said they believe the three girls have made it to their target country. British Prime Minister David Cameron has said the case highlights the need to fight ISIS on multiple fronts.
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Three east London classmates are suspected of traveling to Syria to join ISIS
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"We are not mad at you, we love you," says the family of one girl
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"Find the courage in your heart to contact us," says the sister of another
"@placeholder is a dangerous place, and we don't want you to go there.