VIDEO: Investigators are trying to figure out what caused an RV to erupt into flames early Thursday morning. The big RV fire started off Aurora Avenue North and McGraw Street around 1:15 a.m. Seattle fire said the blaze erupted and threatened to spread to a nearby vacant building. Fortunately, its crews managed to keep it from spreading and no one was hurt. However, KOMO News cameras caught video of cars trying to drive down Highway 99 who had to turn around to get away.