Authorities arrested a woman at a Cedar Rapids police fundraiser Saturday after she reportedly slapped her ex-husband, a Cedar Rapids police officer.

Dawn M. Holmes, 39, of Cedar Rapids, was arrested for domestic abuse assault at an annual fundraiser for local K-9 units. Several witnesses saw her slap Officer Casey Bilden in the face around 1 p.m. at Pets Playhouse, 151 Jacolyn Dr. NW, according to a police report.

Bilden, 41, is an officer with the Cedar Rapids police K-9 unit.

According to police, Holmes was causing a scene at the event and was asked to leave. They said she refused and became confrontational with Bilden.

Linn County Sheriff Brian Gardner, who was in attendance at the fundraiser with his wife, said he witnessed the slap as he was eating under the food tent on the eastern edge of the property.

I heard something out of the ordinary, screaming or yelling, and it caused me to look up from my lunch in time to see the slap, said Gardner, who jumped up to help restrain Holmes.

Holmes was booked at the Linn County Jail and later released on her own recognizance. A no-contact order has since been issued between her and Bilden.Police did not indicate in the report what Holmes was upset about, and attempts to reach her Tuesday were unsuccessful. Bilden, reached Tuesday via text message, declined to comment on the incident.