A tunnel collapse emergency was declared Tuesday at the Hanford Nuclear Facility in Washington.
The alert was activated shortly before 8:30 a.m. at the Hanford Emergency Operations Center due to concerns about subsidence in the soil covering railroad tunnels near a former chemical processing facility, according to the U.S. Department of Energy (DOE).
Authorities said the tunnels contain contaminated materials. It remains unclear if radioactive particles have escaped the tunnel that collapsed.
Workers believe the collapse may have been caused by road crews doing construction above the tunnel location, according to the DOE. Read more here.