A verbal altercation outside a man's home in Northampton ended with him having an unknown liquid thrown in his face, police have said.
The attack happened at around 5.35pm on Thursday, April 15 when a man in Stone Hill Court challenged a young white man who appeared in his front garden claiming that he was being chased.
A group of three young black men then arrived outside the property and, after an argument, the homeowner had liquid thrown in his face. The group then left - one of the young men was riding an electric scooter.
A spokesperson for Northamptonshire Police said: "Tests on the substance the man was sprayed with were inconclusive. He attended hospital but is not believed to have suffered any lasting injury."
Anyone who has any information about the attack is asked to call Northamptonshire Police on 101, quoting incident number: 21000206586.