BREAKING, US Geological Survey says high casualties ‘probable’ after powerful quakes hit South American country.Venezuela has been struck by powerful back-to-back earthquakes, levelling buildings in the capital, Caracas, and prompting fears of mass casualties.A magnitude 7.2 earthquake struck near San Felipe, about 284km (176 miles) west of Caracas, at 22:04 GMT on Wednesday, followed almost immediately by a magnitude 7.5 quake near Yumare, about 293km (182 miles) west of the capital, the US Geological Survey said.The US science agency said that high casualties and extensive damage were “probable”.