Magnitude 6.9 quake strikes Indonesia, second in a day: USGS

A 6.9-magnitude earthquake struck Indonesia's western Sumatra island late Saturday, the US Geological Survey said, the second tremor to hit the vast Southeast Asian nation in a day.

The epicentre was located at Pematangsiantar, about 126 kilometres (78 miles) southeast of the island's capital Medan. The quake stuck at a depth of 183 kilometres, and no tsunami warning has been issued.