Authorities briefly grounded a U.S. Forest Service reconnaissance plane flying over a series of small wildfires in Northern California after a drone flew too close to the scene.
The Forest Service says the plane was grounded for about an hour-and-a-half for safety reasons on Monday near Redding. The owner of the drone was not found.
It was the third time in less than a week that the spotting of a drone over a California wildfire prompted the Forest Service to order planes to land for safety reasons.
Officials fear the drones will collide with firefighting planes. Two tanker planes dropping retardant on a large wildfire in San Bernardino County, 90 miles east of Los Angeles, were briefly grounded June 24 and 25 when drones were spotted over the blaze.