Port-au-Prince has been hit by a strong earthquake measuring 6.1 on the moment magnitude scale, eight days after the Haitian capital was razed by a 7.0 tremor. The quake struck 59 kilometres west of the city, according to the US Geological Survey (USGS). It followed the much more powerful quake on January 12 that is thought to have killed up to 200,000 people. Witnesses say the latest tremor sent people who were camping out in the capital's streets running away from crumbled buildings in panic. Residents reported a low vibration followed by a brief but more powerful rumbling shake at...