A man reportedly asked children for their names, contact numbers and addresses as they made their way to a Sheffield school this morning.
Concerned mum Tamara Cross said her daughter Georgina, 12, was approached by a man outside a row of shops on Hartley Brook Road, Shiregreen, at around 7.30am on Monday.
She said the Ecclesfield School pupil had told her the man asked for a her name and address before she ran home.
Another concerned mum said the man was wearing a red cap and had a grey beard.
South Yorkshire Police has been contacted for more information.