An earthquake of 6.6 magnitude has struck off the coast of Indonesia, the US Geological Survey said on Monday.
The Indonesian geophysical institute BMKG put the quake's magnitude at 6.1.
There has been no further information concerning possible casualties or damage resulting from the quake. No tsunami warning was issued.
According to the Richter magnitude scale, earthquakes starting with a 6.0 magnitude are considered "strong" and can cause moderate to strong damage to poor structures.