A 6.2-magnitude aftershock hit Balochistan Wednesday, just over 12 hours after a powerful earthquake rocked the southwest of the country killing at least 160 people, the US Geological Survey said. The USGS said the aftershock happened at 5:32 pm, nearly 60 kilometres (37 miles) northeast of Quetta -- in the same area as the 6.4-magnitude quake that struck shortly before dawn.