PORTLAND (AP) — Two people have been injured in an explosion aboard a motor boat on the Columbia River along the Washington-Oregon border. KOIN-TV reports a Vancouver fire boat responded to reports of the explosion shortly after 10 a.m. Sunday. Emergency crews extinguished a blaze on the 19-foot ski boat and burning fuel that was on the water. The two victims suffered burns and other injuries that were not considered life threatening. The cause was under investigation.