(Bloomberg) -- Indonesian authorities lifted a tsunami warning issued after a magnitude 7.8 earthquake struck off the island of Sumatra, in a region where an undersea tremor killed hundreds of thousands in 2004.

The tremor hit 500 miles (804 kilometers) southwest of Padang in Sumatra at a depth of about 15 miles, the U.S. Geological Survey said. Indonesia’s national disaster mitigation agency initially reported the quake at a magnitude of 8.3.

State of emergency for Sumatra

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