Emergency services personnel have found four hikers who went missing in bushland in the Mount Warning National Park west of Murwillumbah yesterday.

About 1:30pm, Sunday 8 August, a group of 30 international tourists set off on a walk to the summit of Mount Warning.

Police have been told four members of the group, consisting of a 20-year-old woman, and two men aged 18 and 23 who are all from the USA, and a 19-year-old Englishman, left the summit at 4.30pm to head for the car park at the base of the mountain but never arrived.

The remainder of the group trekked to the car park and contacted police at 8.30pm after they were unable to locate their friends.

Police, SES volunteers, National Parks and Wildlife Service personnel and the Volunteer Rescue Association attended the scene and conducted a search of the area but were unable to locate the four missing hikers.

The search was suspended at 11.30pm and resumed at 6.30am today with the assistance of members of the Volunteer Rescue Association, SES volunteers National Parks and Wildlife Service and the NSW Ambulance Service.

The quartet was found just before 8am today. The 20-year-old woman, who was leading the group, told police they had decided to remain together in the park overnight. The group gathered leaves and wood to make a shelter.

On first light, the group began to walk out of the bush but were met by search teams.

Ambulance paramedics assessed the group, finding none of them had suffered any ill-effects for their night in the bush.