A 15-year-old boy has been arrested on suspicion of repeatedly assaulting a teenage girl in Maidenhead.
Between 3.10pm and 3.20pm on June 14, June 19, July 1 and July 10, the 13-year-old girl was verbally and physically assaulted in the Highway Road and Highway Avenue area.
The latest attack left the girl with a bleeding gum after she was struck around the face.
The attacker is described as being a white teenage boy, of slim build with short brown hair who was wearing a school uniform.
Police are now appealing for witnesses who may have seen the assaults take place.
Investigating officer Detective Constable Victoria Hunt, from Maidenhead CID, said: "Assaults, both verbal and physical, will not be tolerated and we are treating these incidents with the utmost seriousness.
"I ask that anyone who saw these incidents or who has any information to get in touch immediately."
The teenager arrested on suspicion of the attack has been released on bail until August 2.
Call 101 or Crimestoppers anonymously on 0800 555 111 with information.
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The victim of an assault in Cippenham was flown to hospital by air ambulance this afternoon.
A rapid response vehicle, an ambulance officer, an air ambulance and an ambulance crew were all called to an address in Earls Lane at 2.10pm.