The collapse of a partially-built car park in the Mexican capital has killed seven construction workers. At least 10 people were hurt in the accident in Mexico City. <br/><br/>An official blamed a flaw in the construction process on the collapse. He said a heavy load had been placed incorrectly. Heavy lifting equipment was brought in to help with rescue efforts, but rescue workers said no more survivors had been found. <br/><br/>The accident happened in the 'lvaro Obreg'n area in the west of Mexico City