Karina Ariev, a 19-year-old Israeli soldier, was serving at an army base near the Gaza border when Hamas militants kidnapped her on 7 October.
Alexandra, her older sister, came across a video that was circulating on Telegram which showed Karina being taken away in a vehicle.
Alexandra spoke to the BBC about how she is trying to stay hopeful, more than a week after her sister was taken.
Video by Anastassia Zlatopolskai
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