Multiple people were allegedly hit with mace in Cobourg Tuesday night.
Around 7:45 p.m., officers were called to the east end of town for the assault investigation.
Witnesses reported a man spraying a mace-like substance during a dispute.
One person was injured.
A 29-year-old from Cobourg was arrested and charged with assault with a weapon, administering a noxious thing, possession of a weapon for a dangerous purpose, and failing to comply with a release order.