A 7.8 magnitude earthquake has struck off the coast of western Indonesia, the US Geological Survey (USGS) reports.
There have been no immediate reports of damage.
The USGS said the earthquake struck at 19:49 local time (12:49 GMT). It said the epicentre was 805km (500 miles) south-west of the city of Padang, and 24km deep.
Indonesian officials issued a tsunami warning for the regions of West Sumatra, North Sumatra and Aceh.
Australia also issued a tsunami warning for Cocos Island and Christmas Island in the Pacific. It also issued a tsunami watch for Western Australia but this was later lifted.
Read more: BBC