Campers joined police to search through the night for the missing boy, who was last seen at a campsite at Thistledown Farm in Nympsfield, near Stroud at around 7pm last night.
Police said a more extensive hunt was due to start as daylight breaks.
More top news
Sunny spells and scattered showers, with winds easing this afternoon.
Winds easing. Sunny spells and scattered showers this afternoon.
Members vote that legal hunts should not be banned from National Trust land at the Annual General Meeting in Swindon.