Police said they believe they are close to finding missing 13-year-old Erika Kacicova.
Helen Tate of South Yorkshire Police said: "The information we have received is starting to knit together and I feel we are closing in."
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Saffie Roussos, believed to be eight years old, was described as a "beautiful little girl".
The first victim of the Manchester bombing has been named as Georgina Callander, a student from Lancashire.
A 23-year-old man has been arrested in connection with the attack at Manchester Arena last night.