A powerful earthquake has hit waters of western Indonesia, prompting local officials to issue a tsunami warning.
The earthquake took place at local hours 00:37, at a depth of 30 km, near the Indonesian island of Sumatra, 400 km from Banda Aceh.
The quake was 420 km (260 miles) southwest of Banda Aceh, the US Geological Survey said. Indonesia's meterological and geophysics agency, which said the quake was 7.6 magnitude on the Richter scale, routinely issues tsunami warnings for quakes over 7 magnitude.
People in the provincial capital, Banda Aceh – still deeply traumatized by the 2004 quake and tsunami – were rattled from their sleep. They fled their homes and waited outside as sirens blared from local mosques, some hopping in cars and motorcycles and heading for high ground.
Witnesses said about 100 people gathered on a bridge in the city to see if the quake triggered any significant change in its height.
Indonesia is prone to seismic upheaval due to its location on the Pacific "Ring of Fire" - one of the most seismically active regions on earth.