Haiti was struck by a powerful new earthquake early on Thursday morning, shaking already damaged buildings and sending people fleeing into the streets.<br /><br />The 6.1 aftershock was the largest since last week's 7.0 quake.<br /><br />The US Geological Survey said the aftershock was centred about 56km northwest of Port-au-Prince, the Haitian capital.<br /><br />Despite an international aid operation, supplies have been slow to reach survivors and people are fighting for whatever they can get their hands on in collapsed shops.<br /><br />Al Jazeera's Tony Birtley reports from Port-au-Prince.
