The landslide occurred before 3 a.m. (1900 GMT) in Selangor state bordering the capital, Kuala Lumpur, tearing down a hillside into an organic farm, which was operating the campsite illegally.
At least 30 children and 51 adults were registered for an overnight stay, the officials said.
The search and rescue operation for the recovery of missing people is continuing, according to local sources. (ILKHA)