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US authorities are on the hunt for a radioactive mouse living in the grounds of a historic nuclear weapon production plant.
Radioactive mouse droppings were discovered in the grounds of the Hanford nuclear plant in Washington state.
It comes two weeks after a radioactive rabbit was captured on the same site, reports the Tri-City Herald.
Hanford workers have set about 60 mouse traps, but the two mice that have been caught so far were not contaminated.
The mouse and rabbit droppings were found in the same area, leading contractors who are cleaning up the area to believe that the animals ate or drank a common source of radioactive contamination.
The Washington State Department of Health said it does not believe there is any danger to the public.
Hanford reactors produced plutonium for the US nuclear weapons program from 1944 to 1987, including the world's first nuclear bomb and the Fat Man bomb detonated over Nagasaki, Japan.
Workers are now involved in a massive project to clean up the billions of gallons of liquid waste and millions of tons of solid waste created by the transformation of raw uranium into plutonium for bombs.