LYNNWOOD, Wash. --
Police said they are trying to catch arsonists in the North Sound before they set a home on fire, reported KIRO 7 Eyewitness News.
Firefighters said three fires have been set outside local businesses in Lynnwood in the last three weeks.
Investigators said the first fire was set on July 20 at the old Scriber Lake High School. The building was vacant but the fire caused $20,000 worth of damage.
Nine days later, investigators said a flammable liquid was used to torch a buildings roof, then last week a mattress left outside a business on Highway 99 was set afire.
Fire officials said they think three sets of arsonists are to blame and are warning homeowners against leaving boxes and other combustible materials outside.
The fire marshal and Lynnwood police said that as far as they can tell, the fires are not connected by descriptions of suspects or time of day. The only thing that they said connects the fires are that they have been at or outside of commercial businesses where theres no one around and theres debris outside.
Its always a concern for us. I mean at night, if its a business, often theres no one home. So were just talking about property damage. But it that was to transfer to a home, where people are sleeping, thats a very scary thing for us, said Marybeth OLeary of the Lynnwood Fire Department.
Investigators said the only description they have is that the suspects may be young males.