Southern Highlands Governor William Powi told The Associated Press that communication remains difficult and authorities are still trying to assess the extent of the damage caused by Monday's magnitude-7.5 earthquake.

Powi said Wednesday that four people in the capital, Mendi, were killed when their house collapsed on them and three were killed when their home was struck by a landslide. He says eight others were killed elsewhere. Dozens more were injured.

Three oil fields and a liquefied natural gas plant have shut. Powi says the quake caused "catastrophic havoc and destruction" and people remain traumatized.