Just three weeks after a powerful 7.4-magnitude quake hit southern Mexico, the country suffered another tremor Wednesday. A 6.5-magnitude earthquake rocked western Mexico and reverberated more than 200 miles in Mexico City, causing buildings in the capital city to sway. A large-scale evacuation took place, but government officials said there were no reports of damage. The tremor occurred 41 miles below the surface, so much of the energy dissipated before it reached the city. The government remains on alert for aftershocks.