A second strong quake was recorded thousands of kilometres away on Sumatra island in the west of the archipelago, but there were no initial reports of damage or casualties there.

The 7.7-magnitude earthquake off Flores island in eastern Indonesia triggered a tsunami warning - later lifted - and sent thousands of people fleeing.

The 7.7-magnitude earthquake off Flores island in eastern Indonesia triggered a tsunami warning - later lifted - and prompted hundreds to evacuate.