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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Four men are being interrogated in Spain's National Court over the vehicle attacks that killed 15 people and wounded more than 120 others.
In the position paper the Government sets out plans to ensure that cross-border legal disputes are dealt with in a "fair way" post-Brexit.