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.
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The 250 pound unexploded bomb was recovered, as divers checked the sea bed ready for the construction of Hinkley Point C.
Locals have left flowers and notes to remember 27-year-old Tashan Corpe who was stabbed and killed in Foxhill on Sunday.
The family of George Zographou, who had meningitis, confirmed he has passed away after falling ill at the Boardmasters surfing festival.