Washington: A magnitude 6.4 earthquake struck northern Argentina early on Monday, the U.S. Geological Survey said.   

The quake occurred at 2:07 a.m. local time (0507 GMT) and was centered 72 miles (116 km) east-southeast of Santiago del Estero, the USGS said.   

There were no immediate reports of injuries or damage from the quake, which was upgraded from an initial 6.3.          


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