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The U.S. Geological Survey says a 7.3 earthquake struck Japan near the southern island of Okinawa at 3:31 p.m. ET, leading authorities to issue a tsunami warning for the island and evacuate beaches. There were no immediate reports of casualties or damage. Japan is often hit by quakes—one of the worst was a 7.2 quake in 1995 that killed 6,400 people in Kobe.