Young said his office is continuing to investigate who was at the property around the time the fire started.
Officials said Thursday morning it was unclear which agencies would investigate due to the vague jurisdictional boundaries in the area, but Vancouver police’s arson team was on scene.
Clark County fires

Warm, dry and windy conditions fanned several vegetation fires on Monday afternoon, including two that prompted evacuation warnings in two Vancouver area neighborhoods.

Clark County fire crews already got a taste of the summer fire season after battling several brush fires, two of which prompted evacuations, Monday afternoon.

A two-alarm, fast-moving blaze destroyed at least seven businesses in a Salmon Creek industrial complex. No one was injured in the fire that started late…