Indonesian authorities Saturday raised the death toll to 387, the number of injured to 13,688 and those displaced to 387,067 following a 6.9-magnitude earthquake that recently hit the island of Lombok and its subsequent aftershocks.

A spokesperson for the National Agency for Disaster Management (BNPB), Sutopo Purwo Nugroho, warned in a statement that the death toll could further increase because of the ongoing search for victims buried under rubble and landslides after Sunday's temblor.

The northern region of Lombok, where the epicenter was located, is the worst affected with 334 deaths, followed by West Lombok, with 30, East Lombok with 10, Mataram with 9, Central Lombok with 2, and Denpasar, capital of the neighboring island of Bali, with 2.

The eastern area had on Friday reported 11 dead, but BNPB found that later clarified that one victim had been repeated twice, once with his name and a second time with his nickname.

A total of 67,875 houses, 468 schools, six bridges, 50 oratories, 20 offices, 15 mosques and 13 health centers have been demolished or damaged.

Sutopo said in the statement that conditions on the ground were difficult as there were still many victims that had not been evacuated or refugees who had not received adequate attention, coupled with continued aftershocks.

Regional authorities have extended the emergency response period till Aug. 25 given the conditions, which will help in providing assistance to victims, according to the BNPB.

Hundreds of nonprofits and community organizations are participating in the relief process in Lombok

The island has suffered at least 451 aftershocks since the earthquake on Aug. 5, including some strong ones with magnitude 5.9 on Thursday.

Lombok, located next to the Flores plate, had already suffered the impact of another 6.4-magnitude earthquake on Jul. 29 which left 16 dead, 355 injured and 1,500 buildings damaged.

Indonesia sits on the Pacific Ring of Fire, a region of great seismic and volcanic activity in which some 7,000 earthquakes, mostly moderate, are recorded each year.