A powerful earthquake measuring 6.9 on the Richter scale hit the Indonesian island of Lombok on Sunday, just a week after at least 17 people were killed in another earthquake on the island. Authorities issued a tsunami warning but lifted it after several hours, BBC reported.

The United States Geological Survey said the earthquake struck 10 km underground off the island’s north coast.

The Indonesian Red Cross reported that four of its volunteers were injured and transported to a hospital. There was no electricity because of the earthquake and teams of volunteers were preparing first aid support and planning to drive to villages to treat those injured, the organisation added.

The Indonesian archipelago, where Lombok and Bali are located, is part of the Pacific Ring of Fire, an area of intense seismic and volcanic activity.

Two days after last week’s devastating earthquake, another one had struck the island. It triggered landslides around Mount Rinjani, cutting off escape routes and trapping 543 hikers. One hiker and a tourist died in that earthquake.