Police have linked three of the raids in Hitchin (Image: Archant)
A man was left seriously injured following an alleged attack by three other men.
The 21-year-old required surgery after the assault, which damaged his face and jaw.
It took place on Friday night at the three-day Knebworth Park festival’s Red 2 campsite.
A spokesman for Hertfordshire Constabulary said: “We believe three offenders were involved in this assault.
“If anyone has any information about this incident they should call Herts Police on 101 quoting crime reference number G1/14/1678 or if you don’t want to give your name, call Crimestoppers on 0800 555 111.”
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