SEATTLE -- Investigators said three more fires overnight in the city's Greenwood neighborhood were intentionally set.

Fire Department spokeswoman Dana Vander Houwen said two fires were set about 11 p.m. Sunday behind a commercial building in the 7700 block of Greenwood Avenue.

The fires caused about $1,000 damage before they were put out.

A third fire was reported by an arson patrol in the area that smelled smoke about 4 a.m. Monday. It caused about $20,000 damage to the back wall of the Olive You restaurant at 8516 Greenwood Avenue.

The latest fires bring to nine the total number of arsons in the neighborhood in recent weeks.

The worst was a fire on Oct. 23 that destroyed four restaurants and caused $2 million damage.

"We have several fire department units that are patrolling this neighborhood in the overnight hours," Vander Houwen said.

Police area leading the arson investigation. Anyone with information is asked to call 800-55-ARSON.

"If people see anything that's suspicious they need to let us know," Vander Houwen said.

She said firefighters have been asking area businesses to leave outside lights on and make sure no combustible materials are left near their buildings.