According to preliminary data, the child disappeared while descending from the Ural ridge to the Kriv base, 60 km from Severouralsk.
The boy climbed to the top together with his father as part of an unregistered tourist group of 18 people.
"During a trip up the mountain, a 46-year-old man developed pains in his right leg, and therefore at about 17:00, returning to the base, the father allowed his son to return to the parking lot at the foot of the mountain, as he could not move quickly." , - quotes the representative of the Ministry of Internal Affairs Interfax.
Subsequently, it turned out that the child had disappeared on the way back.
An operational headquarters for the coordination of search activities has been created on the spot, about 80 police officers are involved in the search for the child, including a dog handler with a dog, as well as volunteers and specialists from the Ministry of Emergency Situations.
It is planned to attract a quadrocopter with a thermal imager and a helicopter to inspect the forest.
Coordinator of the volunteer search and rescue squad "Lisa Alert" Oleg Leonov, in an interview with the "Zvezda" TV channel, told what rules a child should be taught before walking in the forest.