MEXICO CITY (AFP) - A powerful 6.0-magnitude earthquake struck southern Mexico early Thursday, according to the US Geological Survey. There were no immediate reports of casualties or damage from the earthquake, which struck at 3:20 am (0920 GMT) some 31 kilometers (19 miles) east of the town of Altamirano, in the southern Guerrero state. The epicenter of the earthquake was at a depth of 61 km according to the USGS. The earthquake came a little over a week after a 7.4-magnitude temblor in neighboring Guatemala killed 48 people and injured another 150, making it the country’s most violent earthquake since 1976.