An off-duty lollipop man is recovering in hospital after his ear was bitten off on Monks Road.
The man also broke his leg and ankle in the assault, believed to involve three people on Saturday morning at 7.12am, June 1.
Lincolnshire Police are investigating the assault and have asked any witnesses to contact them on 101.
John Siddle at the Lincolnshire Road Safety Partnership said: “He was not working at the time of the assault.
“We only got involved by making enquiries through his supervisor. He is still recovering in hospital.”
A police spokesperson said: “Incident 98 of June 1 refers to a report of a fight involving three people at a shop on Monks Road.”