A person and a dog were discovered dead in an RV in Lake Stevens after an early-morning blaze, according to Lake Stevens Fire.

The fire was reported by a driver on the Highway 2 trestle around 2:45 a.m. Firefighters found a 30-foot RV fully engulfed in flames in the 5300 block of Riverside Avenue, near the Ebey Slough, the fire department said in a Facebook post. Firefighters had to work defensively.

The fire department did not release any information about the identity of the victim. The Snohomish County Medical Examiner will release the identity and cause of death.

The Snohomish County Fire Marshal and Snohomish County Sheriff’s Office are investigating the cause of the fire.