(CNN) At least 91 people were killed when a 6.9-magnitude earthquake and strong aftershocks rocked Indonesia's resort islands of Bali and Lombok on Sunday, causing people to rush out of homes, hotels and restaurants.

Another 200 were injured, Indonesian authorities said. The number of victims is expected to increase, according to Sutopo Purwo Nugroho, the head of Indonesia's disaster management department.

Hundreds of people have been taken to local hospitals and thousands of homes have been damaged, said Arifin Muhammad Hadi, head of disaster management of the Indonesian Red Cross Society.

The deadly quake was 31 kilometers (19 miles) deep and struck near Loloan on the north end of Lombok. It was also felt on Bali to the west.

The quake occurred in the early evening after sunset and was the second powerful temblor on Lombok in a week. A 6.4-magnitude earthquake shook the island July 29 , killing more than a dozen people and briefly stranding hundreds of hikers on the slopes of a volcano.

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