An Amazon drone sparked an acres-wide fire last summer when it crashed in eastern Oregon during a test flight, according to a Federal Aviation Administration report. The drone's motors failed during the flight in June, the report said, causing it to plummet 160 feet to the ground. A video referenced in the report shows the drone "tumbling in uncontrolled free fall until it contacted the ground," the report said. An "intense lithium battery fire quickly consumed the aircraft," and the fire soon spread to the field where the drone had crash-landed, the report added. "Several acres of wheat stubble field were soon on fire," it said.