Police are searching for a 14-year-old girl who they believe has disappeared with a 35-year-old man.
Schoolgirl Lorna Vickerage, from Doncaster, is thought to be with John Bush, also from Doncaster, South Yorkshire Police said.
A spokesman said: "Lorna and John are thought to have been in the Highfields area over the last two days.
"Lorna was last seen at 2.30pm on Monday June 10 at Outwood Academy in Adwick wearing her school uniform but it is unlikely that she will still be wearing this."
Police said they are both known to frequent the Askern, Adwick, Woodlands and Highfield areas of Doncaster.
Miss Vickerage is described as white, slim build, about 5'4", with long straight, thick blonde hair, while Mr Bush is described as white, stocky build with receding dark blonde hair.
South Yorkshire Police are asking anyone with any information on their whereabouts to call South Yorkshire Police on 101 quoting incident 609 of June 10, 2013.