Sydney, Australia A magnitude-7.3 earthquake struck in the sea off Tonga late Friday, according to the US Geological Survey, sparking a tsunami warning that was later lifted. The USGS said the quake hit 10 kilometres (six miles) deep, about 200 kilometres southeast of Neiafu, a town in the northeast of the Pacific archipelago nation, shortly before midnight local time (1100 GMT). It initially gave the magnitude at 7.1, but later revised […]