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At least two RVs at a homeless camp under the South Spokane Street and East Marginal Way viaduct were damaged by fire Thursday morning. 

It happened around 4 a.m. Fire crews responded to a call of two mobile homes on fire.

One of the RVs is a complete loss. The second RV has heavy front-end damage.

During the fire, smoke could be seen above the viaduct. Investigators checked to see if the fire caused any structural damage.

No injuries were immediately reported.