Another earthquake is threatening to hit Haiti with possibly more force than the massive quake that levelled Port-au-Prince, seismologists say. Aftershocks have already rattled the impoverished Caribbean nation in the days following the January 12 quake that killed over 110,000 people, left nearly 610,000 homeless and injured scores more. On Wednesday, a magnitude 5.9 quake struck people already scrambling to rebuild their tattered lives. But more are likely on their way. The US Geological Survey (USGS) estimated on Thursday that there's a 25 per cent probability that one or several magnitude 6 aftershocks could strike in the coming weeks, although...