A woman was knocked unconscious after being punched in the face.
The victim, aged 45, was first hit with what is believed to be a bag as she was in the Barn Community Centre on Church Lane, Wickersley, Rotherham.
As she turned around, the offender punched her in the face and knocked her out.
After the attack, the victim made her way to St Albans School to collect her children but collapsed again. She was treated in hospital for concussion and bruising.
Witnesses can call police on 101.