It's happened just days after a 16 year old boy was also stabbed in the town.
A14: Objects Thrown At Car
Police are appealing for information after something was thrown at a car on the A14.
Police need to trace a group of boys – thought to be white, around 12-13 years old, including one wearing a black shiny jacket with a hooded top underneath and the hood out of the top of the jacket.
Something was thrown at a vehicle approaching the Dockspur roundabout of the A14 around 4.15pm on Thursday, 15 December.
A 31-year-old woman was driving her car eastbound towards the roundabout when she saw the boys standing to the left of the road just past the pedestrian crossing traffic lights.
As she drove past them she heard a loud bang and when she arrived at her destination a few minutes later she discovered two dents to the bonnet of her car.
Anyone with information about who the group are is asked to call PC 957 Gledhill at Felixstowe on 101.
Five people have been arrested in connection with a stabbing in Ipswich over the weekend.
The family of an 83 year old man murdered in East Harling, have thanked Norfolk Police.
Two men have denied murdering a 26-year-old who was attacked inside a Morrisons supermarket.
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