Deputies say Thursday night around 5:30 p.m., a woman went into one of the restrooms in the downtown building. She says a man was hiding behind a bathroom door and tried to smoother her face with a white cloth.
The woman fell and hit her head, she yelled for help. The man ran away.
The woman was treated for minor injuries.
The sheriff's department is working with Fresno Police in searching for the suspect. Both agencies are also stepping up patrols in the area.