Two women were assaulted in Coney Street in York at the weekend.
It happened outside Waterstones between 9.15pm and 9.30pm on Friday (2 December).
A North Yorkshire Police spokesperson said: “Two women, aged in their 30s were assaulted.
“A 15-year-old girl was arrested on suspicion of assault and resisting arrest.
“A second 15-year-old girl was also arrested on suspicion of assault, resisting arrest and a public order offence.
“Both girls were interviewed and released under investigation.”
Police are appealing for witnesses to come forward.
Anyone with information that could assist the investigation can get in touch via the numbers below.
How to help the police