A 37-year-old man has been arrested on suspicion of child abduction following the disappearance of a 13-year-old girl.
The man, who was arrested in Bradford, West Yorkshire, is currently in police custody and is on his way to Sheffield to be interviewed by officers from the South Yorkshire force.
Police said they received numerous calls after appeals about the disappearance of Erika Kacicova and they are working hard to piece together all the information in a bid to find her.
Erika, who lives in Poole Road in Darnall, Sheffield, went missing at around 4pm last Monday.
Officers issued a plea for Erika to get in touch after previously releasing on bail a 22-year-old man, from Bradford, who was arrested on suspicion of her abduction.
Eastern European Erika is described as being around 4ft 11in and of slim build, with long, dark-brown, straight hair and brown eyes.
She was last seen wearing dark blue jeans, a denim short-sleeved top and a pink Adidas zip-up hoodie. The hoodie has yellow stripes down the sleeves and a white Adidas motif on the front . She was also wearing denim-style ankle boots.
Speaking on Sunday, Detective Inspector Helen Tate said: ''We have had various sightings of Erika today but, as of yet, none have been confirmed. 'It is out of character for Erika to be away from home for so long. We are getting increasingly concerned for her welfare as time goes on.
''Erika is only 13, she is young and a normal teenager, who listens to music and spends time with her family and friends. We want her to return safe and well. 'We have around 50 police officers and staff working hard day and night in a bid to find her. 'We've received dozens of calls from members of the public, some in West Yorkshire and some to us here in Sheffield. Please keep these calls coming in."
She added: "'Erika has two younger siblings, a brother and a sister. They, along with her parents, are distraught at her disappearance. 'Erika, if you are reading this, please let us know you are OK. You're not in any trouble - we just need to know you are safe and well."