A den of six lions mauled to death at least two suspected rhino poachers on a wildlife reserve in South Africa.

Nick Fox, the owner of the Sibuya Game Reserve, said in a that a field guide discovered human remains Tuesday afternoon in the reserveā€™s lion enclosure.

ā€œWe were shocked,ā€ Fox told Ā鶹“«Ć½ Channel Friday. ā€œOn a quick inspection around the site, once I saw human remains, I couldnā€™t let anyone get out of the vehicles even if they were armed. Lions were right thereā€”metres away from usā€”at the time.ā€

Fox said that he found a high-powered rifle with a silencer, an axe, wire cutters and a backpack filled with water and food supplies near to the site, which led him to suspect that the victims were poachers.

ā€œThey were thinking of spending time in the reserve looking for the rhinos,ā€ he said.

An anti-poaching dog alerted her handler on Monday morning that ā€œsomething was amiss,ā€ but the handler was not concerned because it is not unusual to hear lions at night, Fox wrote in the Facebook post.

ā€œIt now appears likely that the dog had been alerted by something else out of the ordinary coming from the lions,ā€ the Facebook post said.

Fox said he alerted the Indalo Anti-Poaching Cluster and the local police, which are now combing the area for clues.

It is not yet clear how many suspected poachers were killed.

South Africa, which is home to an estimated 80 per cent of the worldā€™s rhino population, is dealing with a poaching crisis. More than 1,000 rhinos were poached in 2017, according to figures from the environment ministry.

Poaching, Fox said, is ā€œbecoming more and more common in the areaā€ because rhino horns are coveted and believed to be ā€œmore valuable than gold.ā€

His reserve lost three rhinos in March 2016, when poachers hacked off their horns.