A man was stabbed in the back of the neck with a key during an assault at Cassiobury Park car park.
Police say the driver was attacked after a dispute broke out by the Watford park on Monday April 18.
It happened between 3.40pm and 4.05pm and involved drivers of a silver van and a blue Peugeot 207 car.
It has been alleged one of the men kicked the wing-mirror of the Peugeot, causing it to fall off. He also reportedly punched the victim whilst with his vehicle's keys in hand, which police say caused a "small" wound to the back of the victim's neck.
Police officers immediately attended the car park and say they detained a 39-year-old man from Barnet.
He was taken into custody on suspicion of assault (ABH), criminal damage and common assault. He has been released under investigation while enquiries continue.
As part of those ongoing enquiries, Hertfordshire Constabulary has now issued a public appeal for information and witnesses.
Detective Constable Ashley Young said: "We’ve been carrying out extensive enquiries into this incident and I am keen for any witnesses to come forward. Were you in the area? Did you see what happened? The cars involved were a silver van and a blue Peugeot 207 – perhaps you saw them?
"Any information you have, no matter how small it might seem, could be vital to our investigation. Please call the non-emergency number 101 or email me at Ashley.Young@herts.police.uk quoting crime reference 41/30479/22."
Information can also be reported online at herts.police.uk/report or by contacting Crimestoppers anonymously on 0800 555 111 or via crimestoppers-uk.org.
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