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Tsunami warning siren heard in Alaska after earthquake

Video filmed by Jennifer Sonne, a local resident, showed tsunami warning sirens blaring in the city of Kodiak.

The U.S. Geological Survey (USGS) said the quake, which struck at 10:15 p.m. local time (0615 GMT Thursday), was at a depth of 35 km.

The quake reportedly struck about 91 km east-southeast of Perryville in Alaska. It was about 500 miles from Anchorage, Alaska's biggest city.

It was followed by seven aftershocks, two of them above magnitude 6.0, according to USGS.