A woman who was walking with her mother has been punched and racially abused by a gang of youths near a nature reserve.
Lancashire Police said the women, aged 18 and 53, were approached by up to 25 youths close to Brockholes near Preston at about 18:50 BST on 29 May.
The force said a "white and fat" female punched the 18-year-old and pulled her hair while others hurled racist abuse.
A force spokesman said the pair managed to get away and call police, but the gang had fled before officers arrived.
He said the force wanted to speak to the female, who was wearing a white vest, and another woman, who was "dressed all in black with false nails", in connection with the incident, adding that it was being treated as "racially aggravated assault and racially aggravated public order".
Appealing for information, PC Emma Brookfield said it must have been an "extremely distressing and intimidating ordeal for these two women".