0758 GMT August 19, 2018
The National Disaster Mitigation Agency (BNPB) said the death toll was expected to rise as information comes in from areas where thousands of buildings collapsed or were badly damaged, especially in the north, the quake's epicenter, Reuters reported.
Power and communications were cut in some areas of Lombok, and the military said it was sending in a vessel with medical aid, supplies and logistical support for the island.
Lombok was hit a week earlier, on July 29, by a 6.4 magnitude quake that killed 17 people, injured hundreds and briefly stranded several hundred trekkers on the slopes of a volcano.
The Indonesian Agency for Meteorology, Climatology and Geophysics (BMKG) said that more than 120 aftershocks were recorded after Sunday evening's quake, whose magnitude the US Geological Survey revised down to 6.9 from an original 7.0.
There were no foreigners among the dead and the number of injured stood at 209, BNPB spokesman Sutopo Purwo Nugroho told a news conference.
The tremor was so powerful it was felt on the neighboring island of Bali where, according to BNPB, two people died.
Long lines formed at the airport of Lombok's main town, Mataram, as foreign visitors cut their holidays short.
The Garuda Indonesia airline said it was adding extra flights from Lombok to help tourists leave.
About 1,000 foreign and domestic tourists were evacuated in boats from the three Gili islands off the northwest coast of Lombok, BNPB spokesman Nugroho said via Twitter. No tourists died on the Gilis, he said.