They urged the Morobeans not to take the law into their own hands.
They said many Highlanders had already lost their businesses, houses and other properties during the clash last weekend.
Jerry Makinta from Western Highlands, who claimed to speak on behalf of the leaders in the region, said only a few highlanders were involved in the trouble.
The innocent majority has now been targeted too.
Makinta said the majority of highlanders had lived for a long time in Lae and contributed to the development of the country’s second city.