Arson investigators examined evidence from a fire and acts of vandalism at a Costa Mesa dental office, police said Tuesday.
Employees returned to work after a five-day hiatus last month to discover paint covering the business' name on a window and mail that had been burned, according to Costa Mesa Police Department.
Police first reported the arson.
Costa Mesa Fire Department officials determined an accelerant of some kind was used to help the fire spread.
The investigation is ongoing.
No suspects have been arrested in connection with the crime.
— Lauren Williams