Police were called shortly before 3.50pm on Monday 24 April to Regatta Way, Maldon, to reports of a disturbance.
Officers attended alongside ambulance service colleagues.
They found a man had been assaulted, suffering serious but non-life-threatening injuries. He is receiving hospital treatment.
A baseball bat was recovered from the scene.
Officers arrested a 42-year-old man, from Kent, on suspicion of GBH with intent.
We are continuing to conduct patrols in the area and continue to safeguard the victim.
Detective Inspector Andy Drake said:
“Our investigation into this incident is moving at pace and we are pursuing a number of lines of inquiry to locate a second suspect.
“This incident occurred in a public location with a number of witnesses and there will rightly be a level of concern shared by the all within the community.
“We do believe this was an isolated incident with no wider threat to the public.”
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