A bomb threat prompted officials to evacuate a building at the complex housing America's largest nuclear power plant on Wednesday. Police searched an administrative building outside the protective containment area at the Palo Verde Nuclear Generating Station, which is located west of Phoenix, Arizona. No explosive devices were found and an all-clear was later declared. The plant’s operations were not impacted, authorities said. The facility provides power for around four million people in four states.
March 12, 201401:34